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CAT.NO.295E

MINIATURE AND EXTRA-SMALL BALL BEARINGS

1. Bearing Types and Features

CONTENTS

8. Bearing Lubrication

Deep Groove Ball Bearings - Standard series

Deep Groove Ball Bearings - Thin section series

Deep Groove Ball Bearings - Narrow-width series

Deep Groove Ball Bearings with Flanges - Standard series

Deep Groove Ball Bearings with Flanges - Thin section series

Deep Groove Ball Bearings with Resin Flanges - FN Bearings

Deep Groove Ball Bearings

Deep Groove Ball Bearings with Flanges

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Bearing Dimension Tables

Supplementary Tables

Metric series

Inch series

1. Bearing Number Correspondence Table2. Shaft Tolerances3. Housing Bore Tolerances4. Numerical Values for Standard Tolerance Grades IT5. Prefixes used with SI Units6. SI Units and Conversion Factors7. Inch / Millimeter Conversion8. Steel Hardness Conversion9. Viscosity Conversion

Bearing Technical Section

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1.1 Types and Features1.2 Designation Structure1.3 Cages

2.1 Bearing Life2.2 Calculation of Bearing Life2.3 Dynamic Equivalent Load2.4 Basic Static Load Rating and Static Equivalent Load

3. Bearing Tolerances

4.1 Correction of the Rotation Speed Limit4.2 Rotation Speed Limit for Sealed Deep Groove Ball Bearings

5. Bearing Fits

6. Bearing Internal Clearance

7. Preload of Bearings7.1 Objective of Preload7.2 Methods for Preloading7.3 Preload Force

2. Bearing Life and Load Rating

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8.1 Objective of Lubrication and Methods8.2 Grease Lubrication8.3 Oil Lubrication8.4 Grease Life of Shielded and Sealed Deep Groove Ball Bearings

9. Bearing Torque

10. Bearing Materials

11. Handling of Bearings11.1 General Precautions for Handling11.2 Storage of Bearings11.3 Mounting Bearings11.4 Trial Run and Inspection11.5 Removal of Bearings

12. Ceramic Bearings

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12.1 Properties of Ceramics12.2 Features of Ceramic Bearings12.3 Application Examples of Ceramic Bearings

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13. Products Information 33

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4. Rotation Speed Limit

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Miniature and Extra -small Ball Bearings

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CAT.NO.295E

New edition:MINIATURE AND EXTRA-SMALL BALL BEARINGS CATALOG

Rotation parts for information processing, audio, andvisual equipment that include such features as high toler-ance and low torque are highly desired by users. To meet such demands, we at KOYO exploit state-of-the-art research facilities and leading-edge productionmethods to improve the performance and life of toleranceminiature and extra-small ball bearings.

The information contained in this catalog is the result ofour research activities. We believe that this catalog willaid users in the selection and utilization of miniature andextra-small ball bearings.

Through our efforts in research and technical develop-ment, and by obtaining inspiration from the marketplace,KOYO can continually offer the best technologies, quality,and services. We trust that you will be as satisfied with our latestproducts and services as you have been in the past.

The contents of this catalog are subject to change without prior notice.Every possible effort has been made to ensure that the data listed in thiscatalog is correct.However, we can not assume responsibility for any errors or omissions.

Reproduction of this catalog without written consent is strictly prohibited

Preface

Thank you for your valuable support of KOYO products.Recent industrial applications demand more sophisticationin a variety of machines and equipment.

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1


1. Bearing Types and Features1.1 Types and Features1.2 Designation Structure1.3 Cages

2.1 Bearing Life2.2 Calculation of Bearing Life2.3 Dynamic Equivalent Load2.4 Basic Static Load Rating and Static Equivalent Load


4.1 Correction of the Rotation Speed Limit4.2 Rotation Speed Limit for Sealed Deep Groove Ball Bearings


5. Bearing Fits 6. Bearing Internal Clearance 7. Preload of Bearings

7.1 Objective of Preload7.2 Methods for Preloading7.3 Preload Force

8. Bearing Lubrication8.1 Objective of Lubrication and Methods8.2 Grease Lubrication8.3 Oil Lubrication8.4 Grease Life of Shielded and Sealed Deep Groove Ball Bearings

9. Bearing Torque10. Bearing Materials11. Handling of Bearings

11.1 General Precautions for Handling11.2 Storage of Bearings11.3 Mounting Bearings11.4 Trial Run and Inspection11.5 Removal of Bearings


CONTENTS


13. Products Information

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12.1 Properties of Ceramics12.2 Features of Ceramic Bearings12.3 Application Examples of Ceramic Bearings

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Bearing Technical Section

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4 ) Deep groove ball bearings with locating snap ring With this type of bearing, mounting in a housing is simple, asits positioning in the axial direction is carried out using a locatingsnap ring.

5 ) Shielded and sealed ball bearings These types of deep groove ball bearings are sealed by shieldsor rubber seals to prevent leakage of lubricating grease or entryof foreign matter. Since the appropriate quantity of a high quality lubricatinggrease is factory sealed, the sealed deep groove ball bearingallows simplification of sealing devices around the bearing andfacilitates easy handling.



Miniature and extra-small ball bearings includethose with outer ring flanges, thin section types,and narrow-width types, as well as standard ones.

1 ) Deep groove ball bearings

2 ) Deep groove ball bearings with outer ring flange

3 ) Deep groove ball bearings with resin flange (FN bearings)

1.1 Types and Features

This type of bearing can carry a radial load and axial load inboth directions simultaneously. Featuring low frictional torque, it is suitable for applicationswhere high rotation speed or low noise and vibration are required.

This type of deep groove ball bearing has a flange on one endof the outside surface. Since mounting is carried out using the side of the housing asreference, this type of bearing simplifies installation by easilypositioning itself in the axial direction.

In this type of bearing a resin flange is injection molded aroundthe outside surface, as an alternative to the solid outer ring flange. This newly developed item is approximately 10 % lighter than aconventional deep groove ball bearing with an outer ring flange.

The above are also categorized as open,shielded, and sealed types.

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: dual-sealed type: single-sealed type( )

( ): dual-sealed type: single-sealed type

( )

2RS, 2RDRS, RD

ZZ, ZZX, ZZLZ, ZX, ZL

: dual-shielded type: single-shielded type

2RU, 2RJ3RU, RJ3

(1) Shielded ball bearings ZZ (Z), ZZX (ZX) In this type of bearing, a press-worked shield is utilized. These bearings are classified as Z and ZX types accordingto the manner in which the shield is fixed to the outer ring. A ZL type, in which the inner ring is provided with a groove,is also available. A carbon steel or stainless steel plate is used for the shield.

(2) Contact sealed ball bearings 2RS (RS), 2RD (RD)

〈 Features of the RJ3 resin seal 〉 In a resin seal, resin is used in place of conventional rub-ber, offering high dust prevention ability.

(3) Non-contact sealed ball bearings 2RU (RU), 2RJ3 (RJ3) This type of sealed deep groove ball bearing utilizes a rub-ber or resin non-contact seal. Since the labyrinth is formedbetween the seal lip and the seal groove step in the innerring, it is superior in grease sealability and dust prevention. Being a non-contact type, it is suitable for high-speed appli-cations with low frictional torque requirements.

2RU 2RJ3

ZZ ZZX ZZL

2RS 2RD

〈 Features of the RD seal 〉 The RD seal has a labyrinth structure in the shape of aletter Z formed by the seal lip and inner ring seal groove. The torque requirement of this type of bearing is as low asthat of the non-contact type since the lip is extremely lightcontact with the seal groove of the inner ring, yet this newlydeveloped item offers excellent grease sealability and dustprevention.

Table 1.1 shows dimensional ranges of miniature andextra-small ball bearings.

Reference: Dimensional ranges of miniature and extra - small ball bearings

Remark: For bearings with a larger diameter than miniature and extra-small ball bearings, please refer to the comprehensive KOYO bearing catalog CAT. NO. 201E.

Table 1.1 Dimensional Ranges of Miniature and Extra - small Ball Bearings Unit mm

Classification Miniature Ball Bearing Extra - small Ball Bearing

Metric series

Inch series

D＜ 9 －

D≧ 9

d ＜ 10

Nominal bearing outside diameter

Nominal bearing bore diameter



D＜ 9.525 －

D≧ 9.525

d ＜ 10





A contact rubber seal is included on this type of sealed deepgroove ball bearing. This type of bearing offers excellent grease sealability anddust prevention as its structure is such that the seal lip is incontact with either the shoulder of the inner ring (outside sur-face of inner ring) or with the shoulder step. These bearings come in RS and RD types.

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1.2 Designation Structure

The designation of a bearing indicates the specifications of

68, 69, 60, 62, 63

1～ 9

─ 1 ～／ 1D

／ 1B

specific internal structure

specific bearing outside diameter

specific bearing width

：：：

Z,ZZ ZX,ZZX RS,2RS RD,2RD RU,2RURJ3,2RJ3

：：：：：：

No code

STbearing steel

stainless steel

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M1M2M3

0 ～ 5μm3 ～ 8μm5 ～10μm

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M4M5M6

8 ～ 13μm13 ～ 20μm20 ～ 28μm

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/ /YSMGFG

steel plate -- pressed cage

stainless steel plate -- pressed cage

reinforced polyamide resin -- molded cage

heat - resistant reinforced polyamide resin --molded cage

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P0P6P5P4P2

JIS class 0

JIS class 6

JIS class 5

JIS class 4

JIS class 2

：：：：：

：：：：

specific class (PZ1 - )

ABMA 5PABMA 7PABMA 9P

Oil

GreaseAero Shell fluid12Multemp SRLAndok CMultemp PS2Beacon 325SH44MBarrierta JFE552KNG144

：：：：：：：：

　E FSRACP2B54MBJKN

( For other greases, see Tables 8.2 and 8.3 on page 23 )

NNR

with snap ring groove

with snap ring groove and snap ring

：：

Table 1.2 Metric Series Deep Groove Ball Bearings (Standard Series)

Basic Number

WF53

ー16 96 8

ZZZZ

NR M3M2

MGY SST

P5P0SRKN

single-shielded, dual-shielded

single-shielded, dual-shielded (with stop ring)

single-sealed, dual-sealed (contact type)

single-sealed, dual-sealed (extremely light contact type)

single-sealed, dual-sealed (non-contact type)

single-sealed, dual-sealed (resin non-contact type)

No code

WF

FN

standard type

wide type

outer ring with flange

outer ring with resin flange

：：：：

Bearing type code

Bearing series code

Bore diameter number

Specific item code

Shield/seal code

Bearing ring form code

Tolerance code


Supplementary Code

nominal bearing bore diameter：

Material code

Clearance code

Cage code

PZ5P7Ｐ9Ｐ

Lubricant code

the bearing, such as bearing type, boundary dimensions,dimension accuracy, running accuracy, and internal clearance. It consists of a basic number and a supplementary code.

5


nominal bearing bore diameter 8 mm

nominal bearing bore diameter 4 mm

(Nominal bearing bore diameter ×10)

8040

　WOB,EE

：：

Table 1.4 Inch Series Deep Groove Ball Bearings

Table 1.3 Metric Series Deep Groove Ball Bearings (Specific Dimension Series)

MLWML

1408FN

8040 ー1 ZZ

NR M3M3

Y SMG

STST

P0P5 KN

：：

OBEE

881S ー3

ZZXZZ NR

M3M3

STST

MGYS

P05P

SRKN

FFN：：

　MLWML

standard widthwide type：：

F　

Dimension series code

　F　FN

：：

W

(Nominal bearing outside diameter)

1408

nominal bearing outside diameter 14 mm

nominal bearing outside diameter 8 mm

：：

In addition to JIS designation, KOYO uses supplementarycodes, for ease of understanding of bearing specifications. The designation structure is shown in Tables 1.2 to 1.4.

In general, boundary dimensions of bearings conform toJIS B 1512 (Boundary Dimensions for Rolling Bearings). Designation of such standard bearings is specified by JISB 1513 (Designation of Rolling Bearings).

Basic Number Supplementary Code

Bearing type code

Bore diameter number

Flange code

Outside diameter number



Basic Number Supplementary Code

wide type

standard type

Bearing type code Flange code



(See bearing dimension tables)

( For descriptions of supplementary codes, see Table 1.2 on page 4 )

( For descriptions of supplementary codes, see Table 1.2 on page 4 )

6

In general, a ribbon type or crown type cage made of steelis used in miniature and extra-small ball bearings. The ribbon type cage is used in relatively large bearings,while the crown type is used in smaller ones.

Molded polyamide resin cages are becoming increasinglypopular, as they are advantageous in terms of running torque,grease life, and noise.

The T-molded cage is designed to perform similarly to thatof the single-shielded type bearing.

Table 1.5 shows types, codes, and names of cages used inminiature and extra-small ball bearings.

Table 1.5 Cage Types, Codes, and Names

Cage Type Code Name

YS

/ /Ribbon type cage

1.3 Cages

Crown type cage

Molded reinforced polyamideresin cage

Molded heat-resistant rein-forced polyamide resin cage

T-molded reinforcedpolyamide resin cage

YS

MG

MG



2.1 Bearing Life

When a bearing rotates under a load, the raceway surfacesof the inner and outer rings and the rolling contact surfacesof the rolling elements are constantly subjected to repetitiveloading. Even under proper operating conditions this results in scale-like damage (known as flaking) on the surfaces of the race-way or surfaces of the rolling elements due to materialfatigue. The total number of rotations reached prior to this damageis known as " the (fatigue) life " of a bearing.

Substantial variations in fatigue life occur even if bearingsof the same structure, dimensions, materials, machiningmethod, etc. are operated under identical conditions. This variation in fatigue life, an intrinsic phenomenon to thematerial, is being studied.

The total number of rotations at which 90 % of the samebearings operated individually under the same conditionsshould be free of damage caused by rolling fatigue (in otherwords, bearing life of 90 % reliability), is referred to as "thebasic rating life." If bearings are operated at a constant rate, the basic ratinglife is expressed in total running hours.

In miniature and extra-small ball bearings, it is rare thatfatigue life becomes an issue of concern. Factors affecting the service life of such bearings are thedecline of bearing performance and deterioration of lubricant,which appear before flaking occurs.

Specifically, bearings used for audio and office automationequipment and aircraft instruments are required to offer ahigh level of noise, vibration, and frictional torque perfor-mance. Practical bearing life ends when a bearing becomesincapable of meeting its performance requirements.

FG

7.

8.

7


where,

：

：

：

：

：

：

basic rating life, 106 rotations

basic rating life,　h

dynamic equivalent load, N…（See page 9）

basic dynamic load rating, N

p＝3 for ball bearings

rotation speed, minー1

2.2 Calculation of Bearing Life

2.2.1 Basic Dynamic Load Rating The strength of a bearing against rolling fatigue--that is, thebasic dynamic load rating representing the load-bearing ca-pacity--is the net constant radial load (in the case of a radialbearing) that a bearing, with either the inner/outer ring sta-tionary and the other rotating, can endure for a rating life of 1million rotations. This is known as "the basic dynamic radial load rating (C r )." Its values are given in the bearing dimension tables.

2.2.2 Basic Rating Life The relationship among the basic dynamic load rating, thedynamic equivalent load, and the basic rating life, is expressedby Equation (2.1). If a bearing is to be operated at a constant rotation speed,its life is conveniently expressed in hours as determined byEquation (2.2).

…………………

……………

Total numberof rotations （2.1）

（2.2）

L 10

L 10h

＝

＝ 60n106（）P

C p

（）PC p

………………………………（2.4）

……………………（2.5）

……………（2.6）

　 L 10h = 500 f n3

Life factor

Speed factor

Ball bearings

When a bearing is operated under a dynamic equivalentload P and rotation speed n, the basic dynamic load rating Cof the bearing, which is adequate for meeting the design life,is given by Equation (2.3). Thus, the dimensions of the bearing are determined by se-lecting a bearing from the bearing dimension tables, whichmeets the required dynamic load rating C.

L 10

L 10h

P

Cp

n

C ＝ P …………………（2.3）60n106（）

1/3

L 10h ×

Reference

：

：

f h

f n

＝

＝

＝ ( 0.03n )ー1/3

500×60n106（）

1/3

f n PC

Values of f n , f h , and L 10h are determined approximately bynomograms as shown in Fig. 2.1.

Fig. 2.1 Rotation Speed ( n ) vs. Speed Factor ( f n ) and Life Factor ( f h ) vs. Life ( L 10h )

（ p＝10/3 for roller bearings)

The formula below is derived from Equation (2.2) by apply-ing a life factor ( f h ) and speed factor ( f n ).

Rotation speed

Life

fn

n

fh

10h

1.5 1.0 0.9 0.8 0.7 0.6 0.5 0.4 0.35 0.3

6.05.04.03.53.02.52.01.51.00.90.80.70.6

100 200 300 400 500 700 1 000 2 000 3 000 5 000 10 000 20 000 30 000 50 000 100 000

0.25 0.2 0.19 0.18 0.17 0.16 0.15

10 20 30 40 50 70 100 200 300 500 1 000 2 000 3 000 5 000 10 000

L

Hours

8

L na ……………………（2.7）＝ a1 a2 a3 L 10

125

1

150

1

175

0.95

200

0.90

250

0.75

S０

S１

S２

a1

a2

a3

Table 2.3 Reliability Factor, a1

Reliability,％ L na a1

90

95

96

97

98

99

L10aL 5aL 4a

L 3aL 2aL 1a

1

0.62

0.53

0.44

0.33

0.21

2.2.3 Temperature Corrections for Basic Dynamic Load Ratings When bearings are operated at high temperatures, theirhardness decreases, and their material structure changes. This results in a lower basic dynamic load rating than thatdetermined by use at normal temperature. Once the material structure has changed, it does not re-cover even if the temperature returns to normal. Accordingly, the basic dynamic load ratings indicated inthe bearing dimension tables must be corrected by multiply-ing by a temperature factor shown in Table 2.1.


Table 2.1 Temperature Factor Values

BearingTemperature,

TemperatureFactor

When a bearing which has undergone ordinary heat treat-ment is operated at 120 ℃or higher for an extended period oftime, a substantial dimensional change occurs.

There are bearings that have been subjected to dimensionstabilizing treatment, whose codes and operating tempera-ture ranges are shown in Table 2.2. The hardness of such bearings, however, is low, so in somecases their basic dynamic load ratings may decrease.

Table 2.2 Bearing Dimension Stabilizing Treatment

Operating Temperature Range

Over 100 ℃, up to 150 ℃

Over 150 ℃, up to 200 ℃

Over 200 ℃, up to 250 ℃

Dimension StabilizingTreatment Code

The basic rating life (L 10) expressed by Equation (2.1) isthe (fatigue) life with 90 % reliability. In some applications, the reliability should be higher than90 % for calculating bearing life. Bearing life may be ex-tended by adopting specific materials. In addition, operatingconditions such as lubrication may affect bearing life.

The basic rating life is corrected by taking these conditionsinto consideration. Such bearing life is known as the cor-rected rating life, which is determined by Equation (2.7).

2.2.4 Corrected Rating Life

[Note] When determining bearing dimensions using an L nain which the reliability exceeds 90 %, considerationshould be given to the design and strength of the shaftand housing

where,

：

：

：

：

：

corrected rating life, 106 rotations

basic rating life, 106 rotations (90 % reliability)

reliability factor

bearing characteristic factor

operating condition factor

…………………See（1）

………See（2）

………See（3）

Bearing life at (100 - n ) % reliability--namely,breakage probability n %--considering bearingcharacteristics and operating conditions

L na

L 10

Table 2.3 shows a 1 values used to determine the correctedrating life at reliabilities of 90 % or higher (10 % or less forbreakage probability).

(1) Reliability factor, a 1

℃

9


dynamic equivalent load, N

radial load, N

axial load, N

basic static load rating, N

constant

radial load factor (See Table 2.4)

axial load factor (See Table 2.4)

0.014

0.028

0.056

0.084

0.11

0.17

0.28

0.42

0.56

0.19

0.22

0.26

0.28

0.30

0.34

0.38

0.42

0.44

2.30

1.99

1.71

1.55

1.45

1.31

1.15

1.04

1.00

　

　

　

1

　

　

　

0

　　

　

0.56

F aC 0

eX Y X Y

≦ e 　＞ e

Table 2.4 Radial and Axial Load Factors of Deep Groove Ball Bearings

F aF r

F aF r

(2) Bearing characteristic factor, a2 The bearing characteristic variables pertaining to servicelife are bearing material (steel type and quality), manufactur-ing process, and design. a2 is used for correction in such cases.

KOYO's standard material is a high-quality vacuum de-gassed bearing steel. The results of our tests show it to havesubstantial extended bearing life. The basic load ratings of this material are indicated in thebearing dimension table, where the bearing characteristic fac-tor is : a2 = 1.

For bearings using a specific material aimed at extendingfatigue life, the value of a2 can be greater than 1.

(3) Operating conditions factor, a 3 a3 is used for correction where a bearing operating condi-tion has a direct influence on bearing life (especially, the ad-equacy of lubrication).

When lubrication is normal, a3 = 1. a3 can be greater than1 if the lubrication is especially good.

a3 < 1 under the conditions below.

● Lubricant during operation has low kinematic viscosity Ball bearings ...... 13 mm2/s｛13 cSt｝ max. Roller bearings ... 20 mm2/s｛20 cSt｝ max. ● Use at a very low rotation speed, where the product of pitch diameter of ball set and rotation speed (dmn ) is 10 000 or smaller ● Foreign matter enters lubricant ● Inner and outer rings incline considerably

If the hardness of a bearing decreases during op-eration at high temperatures, a correction to the basicdynamic load rating is required (see Table 2.1 on page8)

[Note]

[Remark] a2× a3 may not be greater than 1 when lubricationis in adequate, even if a 2 > 1 owing to the use of aspecific material. Consequently, in general, a2 ≦ 1 ifa 3 < 1

Since it is not easy to view a2 and a3 as indepen-dent factors, they are treated in some cases as a singlefactor, a23

Bearings are used under different conditions. For example,they are often subjected to a resultant load consisting of ra-dial and axial loads, with their magnitudes being variable.

For convenience, a load of a constant magnitude and di-rection applied to the bearing center, is considered, whichwould make the bearing life equal to that resultant from anactual load and rotation speed. This calculated virtual load is used to estimate bearing life,which is known as the dynamic equivalent load ( P ).

The dynamic equivalent load of a radial bearing receiving aresultant load constant in magnitude and direction is obtainedby Equation (2.8).

2.3 Dynamic Equivalent Load

…………………（2.8）P ＝ X F r + Y F a

where,

：

：

：

：

：

：

：

P

F r

F a

C 0

e

X

Y

For radial bearings,P r：dynamic equivalent radial load

10

………

………

……

Operating Condition f s

BallBearing

Roller Bearing(Reference)

2

1

1.5

3

1.5

3

2.4.1 Basic Static Load Rating Under an excessive static load or with an impact load atvery low rotation speed, bearings can experience local per-manent deformation of the contact surfaces between the roll-ing elements and raceways. The magnitude of this permanent deformation increasesas the load becomes greater. This will eventually impair thebearings ability to operate smoothly.

The basic static load rating refers to the static load corre-sponding to the following calculated contact stress, which isworking at the center of contact between the rolling elementand raceway where the maximum load is applied.


2.4 Basic Static Load Rating and Static Equivalent Load

The total permanent deformation of the rolling element andraceway occurring under such contact stress as indicatedabove is approximately 0.000 1 times the diameter of the roll-ing element.

The static load rating of radial bearings is known as thebasic static radial load rating（C 0 r）. Its values are shown inthe bearing dimension tables.

2.4.2 Static Equivalent Load The static equivalent load is also a calculated virtual load. The magnitude of this load is determined through conver-sion, such that the load would produce a contact stress equalto that produced under actual loading conditions, occurringat the center of contact between the rolling element and race-way under maximum load while the bearing is at rest or rotat-ing at a very low rate.

For radial bearings, the radial load working at the bearingcenter is employed, which is referred to as the static equiva-lent radial load （P 0 r）.

The static equivalent load is obtained by Equations (2.9)and (2.10).

Deep grooveball bearings

Self-aligningball bearings

Roller bearings

[Radial bearing] ... The larger of the values determined by the following two equations is adopted.

X0 F r +Y 0 F a

F r

……………

…………………………

（2. 9）

（2.10）

＝

＝

P 0 r

P 0 r

static equivalent radial load, N

radial load, N

axial load, N

static radial load factor (0.6)

static axial load factor (0.5)

：

：

：

：

：

P 0 r

F r

F a

X 0

Y 0

where,

2.4.3 Safety Factor The permissible static equivalent load is determined by thebasic static load rating of the bearing. The operating limits of a bearing with permanent deforma-tion (local dent) as described in the preceding section de-pends on the bearing's performance requirements and oper-ating conditions.

To estimate the degree of safety ensured for a basic staticload rating, a safety factor is determined through experience.

safety factor (See Table 2.5)

basic static load rating, N

static equivalent load, N

：

：

：

f s

C 0

P 0

where,

f s ＝ ………………………（2.11）P 0

C 0

Table 2.5 Values of Safety Factor f s

High running accuracy required

Ordinary operating condition

Impact load involved

(min.)

・

・

・

4 200 MPa

4 600 MPa

4 000 MPa

11



Table 3.1 Tolerance Classes Selection Standardfor Miniature and Extra-small Ball Bearings

Application Tolerance Class

Precision motors

Magnetic disc spindle motors

VTR cylinder motors

Polygon mirror scanner motors

Printers

Copying machines

Pinch rollers

Stepping motors

Electric power tools

ABS motors

Electric fan motors

Small motors

Axial flow fan motors

Floppy disk drive motors

Tape guide motors

Rotary encoders

Servo motors

Synchro motors

Cleaner motors

Dental hand piece

Magnetic disc drive pivot

Classes 0 and 6

The main factor to consider when selecting the bearing tol-erances is application. Table 3.1 shows standards used to select the tolerances ofminiature and extra-small ball bearings. Use this table as areference when determining the required bearing tolerances.

The tolerance classes of miniature and extra-small ball bear-ings are specified in JIS B 1514 (Tolerances for Rolling Bear-ings) (JIS is based on ISO standards). The tolerance classes of inch series deep groove ball bear-ings conform to ABMA standards.

The tolerance classes for these bearings are as follows:

Table 3.2 shows the limits for chamfer dimensions andTables 3.3 to 3.5 show bearing tolerances of miniature andextra-small ball bearings .

JIS

ISO

ANSI

ABMA

Japanese Industrial Standards

International Organization for Standardization

American National Standards Institute, Inc.

American Bearing Manufactures Association

Reference: Standards and Organizations Related to Bearings

:

:

:

:

・Metric series deep groove ball bearingsJIS Classes 0, 6, 5, 4, and 2

・Inch series deep groove ball bearingsABMA Standard 5P, 7P, and 9P

Table 3.2 Permissible Values for Chamfer Dimensions ( Radial Bearing ) = JIS B 1514 =

Value of rmax or r1max in the axial direction of bearings with nominal width lower than 2 mm shall be the same as the value in radialdirectionThere shall be no specification for the accuracy of the shape of the chamfer surface, but its outline in the axial plane shall not besituated outside of the imaginary circle arc with a radius of rmin or r1min which contacts the inner ring side face and bore, or the outerring side face and outside surface

A

A

A

B

B

B

Axial direction

Bore or outsidesurface

Radial direction

Inner or outer ringside face

rmin or r

1min

rmin or r1min:rmax or r1max:〔〕

Remarks: l .

2.

Radial Direction

0.1

0.16

0.2

0.3

0.5

0.6

1

0.2

0.3

0.4

0.6

0.8

1

2

0.05

0.08

0.1

0.15

0.2

0.3

0.6

Axial Direction

rmax or r1 maxrmin or r1 min

Unit mm

Classes 5 and 4ABMA 5P and 7P

Classes 4 and 2ABMA 7P and 9P

12

　ーー 250　ーー 250

ー 250

ー 250

ー 250

ー 40 ー 120ー 40 ー 120

ー 40

ー 40

ー 40

10

5 6

4

2.5

1.5

ー

ー

7

3

1.5

(2) Inner ring (running accuracy and width)

2.510　2.510　2.510　2.510　2.510　

0.6 1） 2.5 0.6 1） 2.5 0.6 1） 2.5 0.6 1） 2.5 0.6 1） 2.5

Inner ringwidth

variation

0000

0

0

0

Single inner ring width deviation

⊿B s

ー

ー

7

3

1.5

Radial runoutof assembled

bearinginner ringK ia

Facerunout

with bore

Facerunout

withracewayS ia

Single row bearingBearing for paired orstacked mounting 3)

ー0ー0

0

0

0

12151215

5

2.5

1.5

Table 3.3 (1) Tolerances for Metric Series Deep Groove Ball Bearings -- Inner Rings--

(1) Inner ring (bore diameter)

0

0

0

0

0

ー 8

ー 7

ー 5

ー 4

ー 2.5

ー

ー

ー

0

0

ー

ー

ー

ー 4 2）

ー 2.5

2.510　2.510　2.510　2.510　2.510　

0.6 1） 2.5 0.6 1） 2.5 0.6 1） 2.5 0.6 1） 2.5 0.6 1） 2.5

10

9

5

4

ー

Nominal borediameter

d（mm）

Single plane meanbore diameter

deviation

⊿dmp

Single borediameter deviation

⊿dsClass

over

Class 0

Class 6

Class 5

Class 4

Class 2

lower max.upper

8

7

6

5

6

5

3

2

1.5

7,8,9 2,3,40,1

4

3

2.5

Diameter series

VdpMean borediametervariation

Vdmp

Single radial plane borediameter variation

B

B

φD

D

φd

B

φD φd

d��：�：�：�

nominal bearing bore diameternominal bearing outside diameternominal bearing width

��

up to lowerupper max. max. max.

Nominal borediameter

d（mm）

Class

over lowermax. upperup to loweruppermax. max. max.

Class 0

Class 6

Class 5

Class 4

Class 2

Notes: 1) In this dimension classification, 0.6 mm is included 2) Applicable to bearings of diameter series 0, 1, 2, 3, and 4 3) Applicable to individual bearing rings fabricated for paired or stacked mounting

Unit μm


Remarks:

1. The upper tolerances for the bore diameters of cylindrical bore bearings specified in this table do not apply to the area from the bearings ring side face through 1.2 times the maximum permissible chamfer dimension rmax

2. According to revised ANSI / ABMA std 20, ABEC 1, 3, 5, 7, and 9 correspond to Classes 0, 6, 5, 4, and 2, respectively

Unit μm

VB sS d


13

1515 8 9 5 6 3 41.52.5

2.5 1） 18　 2.5 1） 18 2.5 1） 18 2.5 1） 18 2.5 1） 18

VC s

ーーーー88441.51.5

ーーーー88551.52.5

552.52.51.51.5

　

2.5 1）18　　

2.5 1）18　　

2.5 1）18　 2.5 1）18　 2.5 1）18　

18301830183018301830

ー 8ー 9ー 7ー 8ー 5ー 6ー 4ー 5ー 2.5ー 4

0000000000

6756

10129105645ーー

8978

10 4）12 4）

910ーーーーーー

ーーーーーー

ー 4 ー 5 ー 2.5 ー 4

ーーーーーー0000

VDp 3)

7,8,9 2,3,40,1

Open type Shielded /sealed type

0,1,2,3,4

67563322.51.52

45342.54

VDmp 3)

B

B

φD

D

φd

B

φD φd

d��：�：�：�

nominal bearing bore diameternominal bearing outside diameternominal bearing width

��

(2) Outer ring (running accuracy and width)

Outer ring widthvariation

Deviation of asingle outer ring

width

Radial runout ofassembled

bearing outer ring

Kea

Variation of outsidesurface generatrix

inclination with face SD 5)

Assembled bearingouter ring face runout

with raceway　 Sea 5)

Table 3.3 (2) Tolerances for Metric Series Deep Groove Ball Bearings --Outer Rings--

(1) Outer ring (outside diameter)

Nominal outsidediameter

Single plane meanoutside diameter

deviation

Single outsidediameterdeviation

Class

over

Class 0

Class 6

Class 5

Class 4

Class 2

lower max.upper

Diameter series

Meanoutside

diametervariation

Single radial plane outsidediameter variation

up to lowerupper max. max. max.

Nominal outsidediameterD

（mm）Class

over lowermax. uppermax. max.

Class 0

Class 6

Class 5

Class 4

Class 2

Diameter series

max.

Refer to the tolerancefor VBs, with d beingthat of the same bearingRefer to the tol-

erance for ⊿Bs ,with d being thatof the same bear-ing

max.

⊿Cs

1) In this dimension classification, 2.5 mm is included2) Applicable to bearings of diameter series 0, 1, 2, 3, and 43) Applicable where no locating snap ring is fitted4) Applicable to bearings of diameter series 2, 3, and 45) Not applicable to flanged bearings

Notes:

Remarks:1. The lower tolerances for the outside diameters of the bearings specified in this table do not apply to the area from the side face of bearings ring through 1.2 times the maximum permissible chamfer dimension rmax

2. According to revised ANSI / ABMA std 20, ABEC 1, 3, 5, 7, and 9 correspond to Classes 0, 6, 5, 4, and 2, respectively

Unit μm

Unit μm

D（mm） ⊿Dmp ⊿Ds 2)

up to

18301830183018301830

14

18301830183018301830

2.5 1） 18　 2.5 1） 18 2.5 1） 18 2.5 1） 18 2.5 1） 18

5 5 2.5 2.51.51.5

ーーーー88441.51.5

ーーーー11117734

(2) Tolerances for flange width, and running accuracy related to the flange

⊿C1s SD1VC1s Sea1

ー 36ー 43ー 52

10

18

30

ー 36ー 43ー 52

＋ 220

＋ 270

＋ 330

Single flange outside diameter deviation

Field 1 Field 2

0

0

0

10

18

⊿D 1s

1��

1��

φD φD

1��1��

C

CDD：�：�：�

nominal bearing outside diameternominal flange outside diameternominal flange width

Table 3.4 Tolerances for Flanges of Flanged Deep Groove Ball Bearings

(1) Tolerance for flange outside diameter

Nominal flangeoutside diameterD 1（mm）

over up to upper lower upper lower

1. Field 2 is applicable when the outside surface of the flange is used for positioning2. For the tolerance of deep groove ball bearings with resin flanges (FN bearings), see the bearing dimension table

Remarks:

Nominal outsidediameterD

（mm）Class

over lowerupperup to

Class 0

Class 6

Class 5

Class 4

Class 2

Refer to the tolerancefor ⊿Bs of the sameclass, with d being thatof the same bearing

max. max. max.

Refer to the tolerancefor VBs of the sameclass, with d being thatof the same bearing

Single flange widthdeviation

Flange widthvariation

Variation of outside surfacegeneratrix inclination with

flange back face

Flange back facerunout with

raceway

1) In this dimension classification, 2.5 mm is included

Tolerances specified in this table are not applicable to deep groove ball bearingswith resin flanges (FN bearings)

Note:

Remark:


Unit μm

Unit μm


15

Table 3.5 (1) Tolerances for Inch Series Deep Groove Ball Bearings -- Inner Rings--

(1) Inner ring (bore diameter) d ≦10 mm

Table 3.5 (2) Tolerances for Inch Series Deep Groove Ball Bearings --Outer Rings--

(1) Outer ring (outside diameter)

(2) Inner ring (running accuracy and width)

5.1

3.8

1.32.5

ー18ー18ー18

183018301830

7.6

5.1

1.32.5

7.6

3.8

1.3

0

0

0

ー 25.4

ー 25.4

ー 25.4

5.1

2.5

1.3

0

0

ー

ー 25.4

ー 25.4

ー

ー 50.8

ー 50.8

ー

0

0

ー

5.1

2.5

ー

7.6

5.1

ー

ー18ー18ー18

183018301830

ー 6.1

ー 6.1

ー

＋ 1

＋ 1

ー

5.1

5.1

ー

5.1

5.1

ー

0

0

00

ー 5.1

ー 5.1

ー 2.5ー 3.8

0

0

00

ー 5.1

ー 5.1

ー 2.5ー 3.8

2.5

2.5

1.32

2.5

2.5

1.32

(2) Outer ring (running accuracy, width and flange tolerances)

VDmp⊿Ds VDp

ABMA 5P

ABMA 7P

ABMA 9P

D（mm） ⊿C1s VC1⊿D1s

With outer ring flange

ABMA 5P

ABMA 7P

ABMA 9P

D（mm） ⊿Dmp

Shielded / sealed typeOpen type

VDmp⊿Ds VDp

S ea1Kea SD Sea

⊿Cs

VCs

d ≦10 mm

Class

lower max.upper lowerupper max.

Single plane mean borediameter deviation

Single bore diameterdeviation

Single radial plane borediameter variation

Mean bore diametervariation

Class

lowermax. upper

Class

lower max.upper

Class

lower max.upper

3.8

2.5

1.3

5.1

2.5

1.3

ー 25.4

ー 25.4

ー 25.4

7.6

2.5

1.3

7.6

2.5

1.3

0

0

0

⊿Bs

ABMA 5P

ABMA 7P

ABMA 9P

K ia S d S ia VBs

2.5

2.5

1.3

2.5

2.5

1.3

ー 5.1

ー 5.1

ー 2.5

ー 5.1

ー 5.1

ー 2.5

0

0

0

0

0

0

Vdmp⊿ds Vdp

ABMA 5P

ABMA 7P

ABMA 9P

⊿dmp

max.max. max.

Radial runout ofassembled

bearing inner ring

over up to lowerupper loweruppermax. max.max.

Face runoutwith bore

Face runoutwith raceway

Single inner ring widthdeviation

Single row bearing

Inner ring widthvariation

max.max.max.max.max.over up to lowerupper lowerupper

Single plane meanoutside diameter

deviation

Nominal outsidediameter Single outside

diameterdeviation

Single radial planeoutside diameter

variation

Mean outsidediametervariation

Single flangeoutside

diameterdeviation

Radialrunout ofassembled

bearingouter ring

Assembledbearing

outer ringface runout

with raceway

Outerring

widthvaria-tion

Flangeback facerunout withraceway

Flangewidth

variation

Single flangewidth

deviation

Variationof outsidesurface

generatrixinclinationwith face Single row

bearing

Deviation of asingle outerring width

Unit μm

Unit μm

Unit μm

Unit μm

Single outsidediameterdeviation

Single radial planeoutside diameter

variation

Mean outsidediametervariation

Nominal outsidediameter

16

　

na ＝ f 1 ・ f 2 ・ n …………… （4.1）

：

：

：

：

：

：

：

：

F rF a( )C

P

na

f 1

f 2

n

C

P

F r

F a

f 1

f 2

0.54 5 6 7 8 9 10 11 12 13 14 15

0.6

0.7

0.8

0.9

1.0

1.0

0.9

0.8

0.7

0.5 1.0 1.5 2.00.60

The rotation speed of a bearing is restricted chiefly by tem-perature increases caused by frictional heat generated in thebearing. When the speed limit is reached, it becomes impos-sible to continue operation due to seizure and the like.

The limit on rotation speed of a bearing represents the maxi-mum value at which the bearing can continue operation with-out generating seizure-causing heat. Accordingly, the rotation speed limit differs with each bear-ing type, dimensions, and accuracy, as well as with lubrica-tion methods, quality and quantity of lubricant, cage material,loading conditions, etc.

The rotation speed limit for grease lubrication or oil (oil bath)lubrication of each bearing is given in the dimension table. These values are applicable in cases where a bearing of astandard design is operated under normal loading conditions(C /P ≧13, F a /F r ≦ approx. 0.25 ).



: basic dynamic load rating

: dynamic equivalent load

: radial load

: axial load

The classes and brands of some lubricants may not besuitable for high-speed operation even if they are excellentin other features. Consult KOYO if the rotation speed of a bearing exceeds80 % of the catalog value.

4.1 Correction of the Rotation Speed Limit

Under some loading conditions, the rotation speed limitneeds to be corrected by Equation (4.1). Such conditions include cases where C /P ＜13 (namely,the dynamic equivalent load P is equal to or greater thanapproximately 8 % of the basic dynamic load rating C ), and incombined loading applications where the axial load exceeds25 % of the radial load.

where,

corrected rotation speed limit, minー1

correction factor determined from

the load magnitude (See Fig. 4.1)

correction factor determined from

combined load (See Fig. 4.2)

rotation speed limit under normal load condition

(listed in the bearing dimension table), minー1

basic dynamic load rating, N

dynamic equivalent load, N

radial load, N

axial load, N

CP

(basic dynamic load rating)

(dynamic equivalent load)

Fig. 4.1 Values of the Correction Factor f 1 Determined by Load Magnitude

Fig. 4.2 Values of the Correction Factor f 2

Determined by Combined Load

The rotation speed limit for a deep groove ball bearing withcontact seals is limited by the rubbing speed of the portion incontact with the seal. This allowable rubbing speed varies according to the rub-ber material of the seal. In KOYO's deep groove ball bearings with standard RS typecontact seals (nitrile rubber), 15 m/s is used.

The rotation speed limit for individual deep groove ball bear-ings with seals is given in the relevant bearing dimension table.

4.2 Rotation Speed Limit for Sealed Deep Groove Ball Bearings

F aF r

(axial load)

(radial load)

17


In general, light interference fits or slight clearance fits areused for miniature and extra-small ball bearings. Fits of con-siderable interference or clearance can be detrimental.

Selective fitting is recommended if it is possible to selectshafts and housings with bearings classified according to boreand outside diameters. Selective fitting helps narrow down the range of fits so thatbearing performance can be effectively improved.

5. Bearing Fits

In miniature and extra-small ball bearings, housings madeof non-ferrous metal such as an aluminum alloy are frequentlyused. In applications with wide temperature ranges, the hous-ings should be fitted with a steel liner. At low temperatures, the steel liner prevents housing shrink-age and at high temperatures, it minimizes expansion.

Table 5.1 shows fits for tolerance miniature and extra-smallball bearings.

ー 5.1

ー 5

ー 5.1

ー 4

ー 5.1

ー 5

ー 5.1

ー 4

ー 5.1

ー 4

ー 5.1

ー 5

ー 5.1

ー 4

ABMA 5P

JIS Class 5

ABMA 7P

JIS Class 4

ABMA 5P

JIS Class 5

ABMA 7P

JIS Class 4

ABMA 7P

JIS Class 4

ABMA 5P

JIS Class 5

ABMA 7P

JIS Class 4

0

0

0

0

0

0

0

0

0

0

0

0

0

0

7.6T

7.5T

7.6T

6.5T

2.6T

2.5T

2.6T

1.5T

ー

2.6T

2.5T

2.6T

1.5T

2.5L

2.5L

2.5L

2.5L

7.5L

7.5L

7.5L

7.5L

1　L

7.5L

7.5L

7.5L

7.5L

Table 5.1 Fits for Precision Miniature and Extra-small Ball Bearings (JIS Classes 5 and 4, ABMA 5P and 7P)

Note: 1) Symbol T denotes interference, and L, clearance

ー 2.5

ー 2.5

ー 7.5

ー 7.5

ー 6

ー 5

ー 7.5

ー 7.5

＋ 2.5

＋ 2.5

ー 2.5

ー 2.5

ー 1

ー 1

ー 2.5

ー 2.5

Lightinterferencefit

Slightclearancefit

Slightclearancefit

Selective fitrequired

Operating Condition PrincipalApplication

Fit

Medium /high speed

Light /mediumload

Low speed

Light load

Medium /high speed

Light load

Low to highspeed

Light load

Inner ring rotation

Outer ring rotation

Cleanermotors

Electricpower tools

Encoders

Synchronizedinstruments

Servo motors

Floppy diskdrive spindles

VTR cylindermotorsPolygon mirrorscanner motors

Magnetic discdrive spindles

Pinch rollers

Tape guiderollers

BearingClass

Single planemean borediameterdeviation

upper lower

Shaftdiameter

dimensionaltolerance

Fit 1）

(1) Fit on shaft ( d ＜ 10 mm )

⊿dmp

lower upper

Unit μm

18

(2) Fit in housing ( D ≦ 30 mm )

Notes: 1) Symbol T denotes interference, and L, clearance 2) The figures for the upper and lower rows in the fields indicating the tolerances for the bearing outside diameter and fit for JIS Classes 5 and 4, are applicable in cases where D ≦ 18 mm and 18 ＜D ≦ 30 mm, respectively

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

ー 5.1

ー 5

ー 6

ー 4

ー 5

ー 5.1

ー 5

ー 6

ー 4

ー 5

ー 5.1

ー 4

ー 5

ー 4

ー 5

ー 5.1

ー 5

ー 6

ー 4

ー 5

0

0

0

0

0

2.5T

2.5T

2.5T

2.5T

2.5T

0

0

0

5 T

5 T

2.5T

2.5T

2.5T

2.5T

2.5T

10.1L

10 L

11 L

9 L

10 L

7.6L

7.5L

8.5L

6.5L

7.5L

8.1L

7 L

8 L

2 L

3 L

7.6L

7.5L

8.5L

6.5L

7.5L

　0

　0

　0

ー 2.5

ー 2.5

ー 2.5

　0

　0

ー 5

ー2.5

ー 2.5

ー 2.5

＋ 5

＋ 5

＋ 5

＋ 2.5

＋ 2.5

＋ 2.5

＋ 3

＋ 3

ー 2

＋ 2.5

＋ 2.5

＋ 2.5

Clearance fit

Slightclearance fit

Operating ConditionPrincipal

Application Fit

Medium /high speed

Light /medium load

Low speed

Light load

Medium /high speed

Light load

Low to highspeed

Light load

Inner ring rotation

Outer ring rotation

Cleanermotors

Electricpower tools

Encoders

Synchronizedinstruments

Servo motors

Floppy diskdrive spindles

Polygon mirrorscanner motors

Magnetic discdrive spindles

Pinch rollers

Tape guiderollers

BearingClass

Single planemean outsidediameterdeviation Fit 1）

upper lower

Housing borediameter

dimensionaltolerance

ABMA 5P

ABMA 7P

JIS Class 5 2)

JIS Class 4 2)

ABMA 5P

ABMA 7P

JIS Class 5 2)

JIS Class 4 2)

ABMA 7P

JIS Class 4 2)

JIS Class 4 2)

ABMA 5P

ABMA 7P

JIS Class 5 2)

JIS Class 4 2)

VTR cylindermotors

⊿ Dmpupper lower

Slightclearance fit

Slight snug fit

Slightclearance fit

5. Bearing Fits

Unit μm

19



The internal clearance of a bearing refers to the amount ofmovement of the inner ring, while the outer ring remains sta-tionary, or vice versa.

Movement in the radial direction reveals a radial internalclearance, while movement in the axial direction shows anaxial internal clearance (see Fig. 6.1).

In measuring internal clearances of bearings, a specifiedmeasuring load is generally applied to obtain stable measure-ments. Accordingly, measurements taken this way are greater thanthe true clearance due to elastic deformation resulting fromthe measuring load. In general, bearing clearances are specified in true clear-ances.

The amount of internal clearance during operation (knownas the running clearance) influences bearing performance-characteristics such as rolling life, heat generation, noise, andvibration.

Fig. 6.1 Bearing Internal Clearance

Tables 6.1 and 6.2 show radial internal clearances and se-lection standards for miniature and extra-small ball bearings.

The axial internal clearance is dependant on the ball size,curvature of raceways, and radial internal clearance. If the radial internal clearance is constant, the axial internalclearance becomes greater as the ball size and raceway cur-vature increase.

Figure 6.2 shows an example of the relationship betweenradial and axial internal clearance.

Fig. 6.2 Relationship between Radial and Axial Internal Clearance

Table 6.1 Radial Internal Clearances of Miniature and Extra-small Ball Bearings

Clearance Code M 1

0 5 3 8 5 10 8 13 13 20 20 28Clearance

Measured Load, NClearance Correction Value, μm

M 11

M 21

M 31

M 41

M 51

M 61

M 2 M 3 M 4 M 5 M 6

Remark: To convert to the measured clearances, add the correction value shown below

200

150

100

50

0 10 20 30

608625

606 , 684 , 693

695683 , 696

Radial internal clearance,

Axi

al in

tern

al c

lear

ance

,

Bearing number

ı

ı

0

Radial internal clearance Axial internal clearance

min. max. min. max. min. max. min. max. min. max. min. max.

Remark: Miniature ball bearings ... less than 9 mm in outside diameter Extra-small ball bearings ... 9 mm or more in outside diameter and less than 10 mm in bore diameter

Unit μm

2.3

20

Axial loading capacity andaxial rigidity are low

No interference is used forfitting

For light load and low-speed applications

VTR capstan motors

Precision gearinstruments

Servo mechanism

Equipment used atlow-speed

Axial flow fan motors

Magnetic disc drivespindles

Equipment used at lowor medium speed and atnormal temperatures

Cleaner motors

Magnetic disc pivots

Equipment used underhigh temperature andhigh-speed conditions

Adjust internal clearance

Preloading by a spring isrequired

Interference fit may beused

Adjust internal clearance

A non-interference fit isused, as a rule

Use under normal operat-ing load and speed con-ditions

Preloading by spring isrequired at medium speed

M 1

M 2

M 5

M 6

M 3

M 4

0～ 8

13～28

5～13

Ensure narrow clearancewithout clearance adjust-ment in axial direction

Frictional torque is not takeninto consideration

Neither durability nor rigid-ity for axial load is required

Normal frictional torque isaccepted for operation withaxial load

Carry out clearance adjust-ment in axial direction

Ordinary durability and rigid-ity are required for axial load

Under axial load, frictionaltorque should be reduced

Carry out clearance adjust-ment in axial direction

High durability against radi-cal changes in temperature

High durability and rigidityare required for axial load

Application ClearanceCode

RemarkRadial Internal

Clearance,μm

Bearing PerformanceRequirements

1.

2.

3.


Table 6.2 Selection Standards for Radial Internal Clearances of Miniature and Extra-small Ball Bearings

1.

2.

3.

1.

2.

3.

4.

1.

2.

3.

1.2.

3.

4.

1.

2.

3.

21


●

● To improve the positioning accuracy in the radial andaxial directions, and to improve the running accuracy,by minimizing runout● To prevent bearing noise caused by vibration and reso-nance

Table 7.1 Methods for Preloading

Fixed-position Preloading Constant-pressure Preloading

A method usingduplex bearings inwhich differences inwidth are precorrected(as shown below)

A method usinga spacer ofa precorrected size

A method using a coil springor conical spring

A method using a wavy washer

7. Preload of Bearings

[ ]Comparison between Fixed-position Preloadingand Constant-pressure Preloading

● Given the same preload force, fixed-position preloadingproduces smaller axial displacement. In other words,high rigidity is readily achieved by fixed-positionpreloading● In constant-pressure preloading, springs absorb loadvariations and volume changes of the shaft caused bythe temperature differentials between the shaft and hous-ing. Hence the preload force varies little and is stable● With fixed-position preloading a greater preload forcecan be realized

2δ�1δ�

Preload can be applied to prevent noise caused by vibra-tion. If, however, excessive preload is applied to a bearing,unusual heat, an increase in friction, and/or a reduction infatigue life may result. Accordingly, the chosen preload force should fall within arange that produces no adverse effect. In bearings for small motors, a wavy washer is generallyused to apply light preload.

A guide to preload forces for miniature and extra-small ballbearings is shown in Table 7.2.

Preload Preload Force Feature

Table 7.2 Preload Forces for Miniature and Extra- small Ball Bearings

Lightpreload

Mediumpreload

Heavypreload

1.0 ％ of C or less



Axial rigidity not required

Low torque is important

Both axial rigidity andlow torque are required

Axial rigidity is important

Rather high torque isacceptable

C : basic dynamic load rating of bearing, kN

7.1 Objective of Preload

In general, bearings are used with the proper internal clear-ance during operation. Some bearings for small motors are given a negative clear-ance by applying a preset axial load so as to minimize vibra-tion. This way of using bearings is known as preloading.

7.2 Methods for Preloading

Consequently, fixed-position preloading is suitable whenhigh rigidity is required. Constant-pressure preloading is ap-propriate for high-speed applications and the prevention ofaxial vibrations.

Preload is applied by fixed-position preloading or constant-pressure preloading. Typical examples of these methods areshown in Table 7.1.

7.3 Preload Force

● ● ●

22

In general, shielded and sealed bearings have a suitablequantity of lubricating grease ready packed, so they can beused in their original condition.

Normally, the quantity of sealed grease is approximately 30% of inner space of the bearing. If more grease is applied, the bearing torque will increasewhich may lead to a leakage of grease or an increase in heat. Therefore, care should be exercised in this regard.

Grease life depends on its ability to resist oxidation andheat the evaporation rate of the base oil. As bearing perfor-mance is greatly affected by the brand and type of greaseused, consult KOYO prior to selecting a grease.

Table 8.2 shows general-purpose lubricating greases usedin miniature and extra-small ball bearings. Lubricating greasesdeveloped by KOYO are shown in Table 8.3.

Table 8.1 Comparison of Grease and Oil Lubrication

・Sealing device

・Lubrication performance

・Rotation speed

OilGreaseItem

Simple

Good

Low / medium speed

Rather cumbersome

Relatively short

None

Difficult

・Replacement of lubricant

・Lubricant life

・Cooling effect

・Dust filtration

Simple

Long

Good (circulation required)

Simple


8.1 Objective of Lubrication and Methods

Lubrication is critical for bearings. The suitability of a lubri-cant and lubrication method greatly influences performanceand bearing life.

[ Functions of Lubrication ]

● Lubrication of each part of a bearing reduces frictionand wear● Removes heat generated in bearing by friction andother causes● Extends bearing life by constantly forming an appro-priate oil film between the rolling contact surfaces● Provides rust prevention and dust proofing

Bearing lubrication methods take advantage of either greaseor oil. Table 8.1 shows a general comparison of these methods.

Rather complicated(Care should be taken regarding maintenance)

Excellent

Suitable also for high speed applications

8.2 Grease Lubrication

Oil lubrication is superior to grease lubrication if it is neces-sary to reduce the starting or running torque to an extremelysmall value or if the load is very small and the rotation speedis high. Specifically, if a low torque is required in a low-speed appli-cation, bearings are run with a few drops of oil.

For high-temperature and high-speed applications, oil jetor oil mist lubrication is used. Oil mist lubrication is espe-cially effective in high-speed applications.

KOYO's standard lubricating oil is Aero Shell Fluid 12(MIL- L- 6085A).

8.3 Oil Lubrication


23


DroppingPoint,℃

OperatingTemperatureRange, ℃

Table 8.2 General - purpose Lubricating Greases

Table 8.3 Lubricating Greases Developed by KOYO

SR

AC

P2

B5

4M

BJ

Multemp SRL

Andok C

Multemp PS2

Beacon 325

SH44M

Barrierta JFE552

Kyodo Oil Lithium soap Ester oil 248

196

276

273

241

265

191

250 min.

198

194

224

250 min.

－ 40～130

　 0～130

－ 40～100

－ 50～100

－ 30～180

－ 30～250

For wide tem-perature range

Code ApplicationBrand Manufacturer Thickener Base OilDropping

Point,℃

OperatingTemperatureRange, ℃

KN

K7

52

KV

VC

KNG 144

KNG 170

KAM 5

KVA

KVC

Diurea 247

245

267

332

285

186

－ 30～130

－ 40～150

－ 30～140

－ 40～100

－ 40～150

Esso

Kyodo Oil

Esso

Dow CorningToray

NOK Cruba

Sodium soap

Lithium soap

Lithium soap

Lithium soap

Fluorinecompound

Mineral oil

Diester oilMineral oil

Diester oil

Silicone oil

Fluorinesynthetic oil

For low torque

For hightemperatures

For hightemperatures

For low torqueand low tem-peratures

For low torqueand low tem-peratures

Code ApplicationBrand Thickener Base Oil ApplicationExample

Diurea

Diurea

Lithium soap

Lithium soap

PolyalphaolefinMineral oil

Polyalphaolefin

Ester oil

Ester oilEtheral oil

PolyalphaolefinEster oil

250 min.

192

250 min.

260 min.


For high speedrotations andhigh temperatures

For low torqueand low noise

General-purposemotors, HDD pivots

General-purposemotors

General-purposemotors, air condi-tioner motors

VTR drum spindles

Cleaner motors


For high speedrotations andhigh temperatures

Consistencyafter 60 roundsof mixing( )

Consistencyafter 60 roundsof mixing( )

24

( )


……… （8.1）

log L ＝ 6.10ー4.40×10ー6 dmn

ー（0.021ー1.80×10ー8 dmn)T

L

dm

n

P

C

T

：

：

：：

：

：

：

grease life, h

, mm

rotation speed, minー1

equivalent radial load, N

basic dynamic load rating of bearing, N

bearing temperature, ℃　

D + d2

There are some factors that have considerable influenceon the frictional torque of bearings. Such factors include thecage sliding friction, rolling friction caused by load, and theviscous resistance of the lubricant. It is possible to minimize the cage sliding friction and therolling friction by means of an appropriate design and a toler-ance finishing of the parts.

Bearing torque fluctuates depending on slight variations andwaviness in the raceway surfaces as these impair movementsof the rolling elements. The torque also varies according to the viscous resistanceof the lubricant, which changes with rotation speed, the qual-ity and quantity of lubricant, and temperature.

The frictional torque of a bearing is classified into startingtorque and running torque.

The starting torque is that which is required to overcomethe bearing's static friction. The starting torque varies de-pending on minor differences in tolerance of the raceway sur-faces and rolling elements and the position of the rolling ele-ments on the raceway surface immediately before the start.

The running torque refers to the frictional torque of a run-ning bearing. Its magnitude changes with rotation speed, thequality and quantity of lubricant, and atmospheric tempera-ture.

Typical data on running torque are shown in Figs. 9.1 to9.3.

ー2.50 　　ー0.05（）CP

8.4 Grease Life of Shielded and Sealed Deep Groove Ball Bearings

Grease life of shielded and sealed deep groove ball bear-ings in which grease is sealed is estimated by the equationbelow.

D： bearing outside diameterd： bearing bore diameter( )

where,

To apply Equation (8.1), the conditions below must be met.

Bearing temperature T ℃

The equation is applicable when 50 ≦ T ≦ 120.( If T ＜ 50, assume that T ＝ 50 )If T ＞ 120, consult KOYO.

Rotation speed dmn

The equation is applicable when 12.5×104 ≦ dmn ≦ 50×104.( If dmn ＜ 12.5×104, use dmn ＝12.5×104 )If dmn ＞ 50×104, consult KOYO.

Load

The equation is applicable when 0.05 ≦　 ≦ 0.2.

If ＜0.05, consider 　＝0.05

If ＞0.2 , consult KOYO.

①

②

③

9. Bearing Torque

CPCP

CP

CPC

P

25


● Relationship between Rotation Speed and Running Torque In general, running torque increases as rotation speed increases (Fig. 9.1).

Fig. 9.1 Relationship between Rotation Speed and Running Torque

● Relationship between Temperature and Running Torque Running torque increases as temperature decreases(Fig. 9.2).

Fig. 9.2 Relationship between Temperature and Running Torque

● Relationship between Quantity of Sealed Grease and Running Torque Running torque increases as the quantity of sealed greaseincreases (Fig. 9.3).

Fig. 9.3 Relationship between Quantity of Sealed Grease and Running Torque

695

W693

608

�

Multemp SRL�30 ％�20 ℃�

：�：�：�

3.5

3

2.5

2

1.5

1

0.5

01 800 3 600 7 200

mN ・m

minー1

Tor

que,

Rotation speed,

Grease brandQuantity of sealed greaseAtmospheric temperature

MultempSRL

Beacon 325

KNG 144

�BearingRotation speed

Quantity of sealed grease

608�1 800 minー1�30 ％�

：�：�：�

0

6

5

4

3

2

1

－20 0 6020

℃�

mN ・m

Tor

que,

Atmospheric temp.,

Multemp SRL

Beacon 325

KNG144

�Bearing�

Rotation speedAtmospheric temperature

608�1 800 minー1�20 ℃�

：�：�：�

2.5

2

1.5

1

0.5

05 3015

Quantity of sealed grease,％�mN ・m

Tor

que,

26

Most bearing rings and rolling elements of miniature andextra-small ball bearings are made of high carbon chromebearing steel. Where bearings need to be corrosion resis-tant, martensite stainless steel is used.

For cages and shields, materials such as carbon steelsheets, stainless steel sheets (JIS SUS300 / 400 series), phe-nol resin, and reinforced polyamide resin are used.

Resin products used for miniature and extra-small ball bear-ings and their respective operating temperature ranges areshown in Table 10.3.

Resin Products used for Miniature andExtra-small Ball Bearings and TheirRespective Operating Temperature Ranges

　

ー 40～150

ー 40～180

ー 10～120

　

ー 30～130

ー 30～150

ー 10～100

MG

FG

RJ3

Resin cage

Resin seal

ResinProduct

CodeTemporary 1)

Operating Temperature Range, ℃Continued use

Note 1) "Temporary" denotes 2 to 3 minutes. Operation at such temperatures should not exceed 30 minutes

High carbonchrome bear-ing steel

JIS SUJ2

JIS SUS440C

Steel Class Code SimilarSteel Class

0.95～1.10

0.95～1.20

0.15～0.35

≦1.00

Chemical Composition, ％

C Si Mn P S Cr Mo

≦0.50

≦1.00

≦0.025

≦0.04

ー

≦0.75

≦0.025

≦0.03

1.30 ～1.60

16.00～18.00

60～64

58～62

BearingHardness,HRC

SAE 52100

SAE 51440C

Table 10.2 Chemical Composition of Materials Used for Bearing Rings and Rolling Elements in Miniature and Extra-small Ball Bearings

Property

Cage

Shield / seal

Operating temperature 1）

Dynamic load rating

Static load rating

Frictional torque

Application

150 ℃ max.

High

High

Low

Reinforced polyamide resin

High-speed applications

Table 10.1 Materials Used for Miniature and Extra-small Ball Bearings and Their Properties



Materials used for miniature and extra-small ball bearingsand their properties are shown in Table 10.1. Chemical composition of materials used for bearing ringsand rolling elements in miniature and extra-small ball bear-ings are shown in Table 10.2.

Material

High carbon chrome bearing steel Stainless steel

Stainless steel sheet

300 ℃max.

85 % of bearing steel

80 % of bearing steel

Bearing ring /rolling element

General /high-tolerance purposes

Carbon steel sheet /stainless steel sheet Nitrile rubber /

reinforced polyamide resin

Corrosion / heatresistance

Higher thanbearing steel

Actual operating temperature is limited by cage material, seal material, and lubricant.Table 10.3 shows a guideline for operating temperature ranges in relation to resin cages and resin seals.If it is necessary to use a lubricant containing a specific additive, consult KOYO

Stainlesssteel

Table 10.3

Note 1)

27


Fig. 11.1 Shaft Diameter Measuring Positions

Fig. 11.2 Measuring Positions of Housing Bore Diameter

Additionally, carry out a thorough inspection of the shaftand housing fillet radius and shoulder quareness.

Bearings are shipped after high-quality rust preventive oilis applied to them followed by suitable wrapping. Their qual-ity is guaranteed as long as the wrapping is not damaged.

Bearings, if to be stored for an extended time, should be storedon a shelf at least 30 cm above the floor under conditionsof 65 % or less humidity at a temperature of around 20℃. Avoid any place that allows direct exposure to the sun orcontact with a cool wall.

11. Handling of Bearings

Since miniature and extra-small ball bearings are made toa higher tolerance than ordinary mechanical parts, one shouldaccordingly handling them with due care.

11.1 General Precautions for Handling

1)2)

3)4)

5)

6)

・・・・・・

Maintain bearings and their vicinity cleanHandle with care A severe shock to a bearing by rough handling may result in flaws, dents, fractures, and chipping.Use the correct tools for handlingExercise care for the prevention of rust Avoid handling them in a highly humid place. Wear gloves to prevent body oils from contactingthe bearing surface.Bearings should be handled by knowledgeablepersonsWork standards for handling bearings should beformulatedStorage of bearingsCleansing of bearings and surrounding partsInspection of dimensions and finish of partssurrounding bearingsMountingInspection after mountingMaintenance / inspection (regular inspection)

11.2 Storage of Bearings

11.3 Mounting Bearings

11.3.1 Precautions for Mounting1) Preparation Unwrap bearings just prior to mounting because they arewrapped to prevent rust.

The rust preventive oil applied to bearings offers good lu-brication, so bearings for general use or grease-sealed bear-ings can be used immediately, without cleansing. For measuring instruments and open type bearings for high-speed applications, remove preventive oil with clean wash-ing oil. As rust is easily formed on bearings after they are cleansed,do not leave them unattended for long periods.

2) Inspection of Shaft and Housing Clean the shaft and housing and verify that they are flaw-less and have no burrs caused by machining. The inside of the housing should be absolutely free fromany residual lapping compound (SiC, A l 2O 3, etc.), moldingsand, or chips.

Next, ensure that the shaft and housing are fabricated tothe dimensions, shapes, and finish as specified on the de-sign drawing.

Measure the shaft diameter and bore diameter of the hous-ing at several positions as shown in Figs. 11.1 and 11.2.

28

11. Handling of Bearings

11.3.2 Mounting Bearings Different methods are used to mount bearings dependingon model and fitting conditions. Since, in many cases, theinner ring rotates, an interference fit is used for the inner ringsand a clearance fit is used for the outer rings. If the outer ring is to rotate, an interference fit is used for theouter rings.

Table 11.1 shows methods used to mount bearings with aninterference fit.

Trial run and inspection are carried out when bearings havebeen mounted, to check whether the mounting is appropri-ate.

In the case of small machines, the rotation condition is ex-amined initially by manual operation. After confirmation thatno fault exists as noted below, a further inspection is carriedout by a powered run.

●

●

●

Table 11.1 Press-fitting of Cylindrical Bore Bearings

Press-fitting Method Description

Whatever method is used, force should be applied to the bearingevenly. For that purpose, use a fixture and fit bearing gently. Do not apply a fixture to the outer ring for press-fitting of the innerring, or vice versa

Press-fittingof inner ring ）

When both inner and outerrings of non-separable bear-ings require interference,use two kinds of fixtures asshown on the right andpress-fit the bearing gentlybecause rolling elements arelikely to be damaged. Do not use a hammer insuch cases Simultaneous press-fitting

of inner and outer rings

(a) Use of press (most common)

(b) Use of nut and bolt (c) Use of hammer

To be used only whenno other method isavailable〔〕

Threaded ho lemust be bored inshaft end〔〕

●

●

11.4 Trial Run and Inspection

…………………

………　

………

Knocking

Excessive torque(heavy)

Uneven runningtorque

Possible causes are entry offoreign matter, flaw in rollingsurfaces, etc

Possible causes are friction inthe sealing device, insuffi-cient clearance, mounting er-rors, etc

Possible causes are defec-tive mounting, mounting er-rors, etc

(Hydraulic pump)

Mounting fixture

Mounting fixture

（ Press-fittingof inner ring ）（Press-fitting

of outer ring）（

Mounting fixture

Mountingfixture

）（

29


Before removing bearings, consider their use after removal.

If bearings are to be disposed of, adopt as effortless amethod as possible. Removing bearings for re-use or to identify causes of fail-ure should be carried out with the same care as at time ofmounting to avoid damage.

Specifically, bearings fitted with an interference are likely tobe damaged during removal, how to remove bearings shouldbe taken into consideration at the design stage. It is recommended to design and make an appropriate jigfor removal.

Marking the direction and position on the bearing is usefulfor identifying the causes of failure.

Bolt holes and bolts for removal

Table 11.3 Removal of Outer Ring

Outer Ring Removal Method Description

Bolt holes should have been bored inadvance and be used to remove anouter ring fitted with interference

●

Table 11.2 Removal of Cylindrical Bore Bearings

Inner Ring Removal Method Description

When removing a non-separable bear-ing, no external force should be appliedto the rolling elements

The simplest way is to draw out thebearing with a press as shown in Fig.(a). Provide a fixture to apply the forceto the inner ring

The method illustrated in Fig. (b) usesa specific removal jig. Ensure that the claws of the jig catchthe side face of the inner ring(a) Removal by press (b) Removal by jig

●

●

●

11.5 Removal of Bearings ●

Tables 11.2 and 11.3 show common methods used for re-moving bearings for re-use or to investigate causes of failure,with interference fits.

Removal Methods

Fixtures

30

Ceramics (silicon nitride) are suitable for making high-speedand light-weight bearings. Ceramic bearings have excellent features in that they arehighly rigid, heat resistant, and highly corrosion resistant, aswell as non-magnetic and non-conductive. Ceramic miniature and extra-small ball bearings are usedin a wide range of advanced technological areas.

For details of ceramic bearings, refer to the KOYO ExtremeSpecial Environment Bearings Catalog (EXSEV bearings),CAT. NO. 208E.

Table 12.1 shows a comparison between characteristics ofceramics and high carbon chrome bearing steel.

Less likely to generate adhesion (transfer)between rolling contacts if oil film diminishes

120

3.2

℃

ItemUnit

Ceramics（Si3N4）

Bearing Steel（SUJ 2）

Features and Characteristics of Ceramics

g / cm3



12.1 Properties of Ceramics

Table 12.1 Comparison between Characteristics of Ceramics (Si3N4) and High Carbon Chrome Bearing Steel (SUJ 2)

Maintains high load capacity at high temperatures

Reduction in centrifugal force of rolling elements(balls and rollers)→ Lengthened life and prevention of temperature increase

Small changes in internal clearance caused bytemperature increase→Prevention of vibrations, and small changes in preload force

Minor deformation in rolling contact zone→ High rigidity

Serviceable in special environments such asacid or alkali solutions

Minor rotation fluctuations caused bymagnetic forces in a strong magnetic field

Prevention of electric pitting (motors etc.)

Heat resistance

Density

Coefficient oflinear expansion

Modulus of longitudinalelasticity

Poisson's ratio

Bonding form of material

Electrical conductivity

Magnetism

Corrosion resistance

Covalent bond

Insulant

Non-magneticmaterial

Good

0.29

314

1 400～1 700

3.2×10ー6

Metallic bond

Electricalconductor

Ferromagneticmateria

No good

0.3

206

700～800

800

12.5×10ー6

7.8

GPa

HV

1/℃

Vickers' hardness

31


12.2.2. Long Life The service life of ceramic bearings is several times longerthan that of steel bearings; not only with grease lubrication,but also with oil lubrication.

Test bearing

Bearing

Rotation speed

Load

Grease

629 ZZL50 000 minー1（dn 45×104）

axial 108 NKNG 170(Grease fill is 25 % of inner space)

：

：

：

：

12.2.1. High rotation speed Ceramics are lighter than bearing steel. Accordingly, thecentrifugal force and sliding caused by gyroscopic momentsare reduced in rolling elements rotating at a high speed ifthey are made of ceramics. Consequently, ceramics are highly effective in controllingtemperature increases.

Test bearing

Performance

Ceramic bearings are capable of rotating at a 15 % higherspeed than steel bearings

Bearing

Ball

Cage

3NCOB74ST4M3

Ceramics (silicon nitride)

SUS440C

Heat-resistant reinforced polyimide resin1 2 3 4 5

4

2.5

1Standard bearing (Steel sheet cage)

Standard bearing(Molded resin cage)

Hybrid ceramic bearing

Life ratio

φ6.350

φ3.175

2.380

5

6

4

3

2

1

0 0.1 0.2 0.3 0.4 0.5 0.6 0.7

Supplied air pressure, MPa

Ceramic bearing

Steel bearing

Rot

atio

n sp

eed,

×10 5min

ー1

12.2 Features of Ceramic Bearings

●

Inner andOuter Rings

Unit mm

Performance

32

12.3 Application Examples of Ceramic Bearings

：

：

：

：

Test method

thrust tester

1 400 minー1

axial 1 176 N (per ball)

class 1 turbine oil (ISO VG56 equivalent)

Shaft washer�（SUJ 2）��Flat platetest piece

Balls（SUJ 2）�3/8" × 3

Cage

Shaft

97.5

90

50

10

21 2 5 10 20 50 100 200 500

Life time, h

Bearing steel

Regressionline of all results

Ceramics (silicon nitride)

Regression line obtained by discarding all results higher than 50 %

Cum

ulat

ive

brea

kage

pro

babi

lity,

％�


TurbochargersSpindle motorsDental hand piecesPolygon scanner motorsYarn twisting spindlesStepping motorsHeat rollersSemiconductor production facilitiesVacuum equipmentAero space development related equipment

・・・・・・・・・・

12.2.3. Light Weight The density of ceramics is approximately 40 % of bearingsteel. Therefore, ceramics are an ideal material for reducingthe weight of bearings.

12.2.4. Small Dimensional Changes with Respect to Temperature The coefficient of linear expansion of ceramics is small(25 % of bearing steel).

12.2.5. High Rigidity The hardness and the modulus of longitudinal elasticity aregreater than that of bearing steel.

12.2.6. Insulation Prevents electric pitting

Test apparatus

Rotation speed

Load

Lubricant

Performance

33



KOYO is engaged in the manufacture and sales of all typesof tolerance miniature and extra-small ball bearings such asopen and sealed types as well as those with outer ring flangeand locating snap ring.

● Miniature and Extra-small Ball Bearings

Our recent developments, which include ceramic bearingsand those with resin flanges, are used in a variety of applica-tions.

34

Ceramic Bearings (EXSEV bearings)

FN Bearings Miniature and Extra-small Ball Bearings with Resin Flanges

Miniature and Extra-small Ball Bearingswith Resin Seals

●

● ●


( )

35


We also produce a number of applied products such asbearings with resin or rubber pulleys and small spindle unitshaving built-in bearings.

For additional products, consult KOYO.

● Miniature and Extra-small Ball Bearings with Pulleys

● Small Spindle Units

36

Miniature Linear Ball Bearings

● Miniature One-way Clutches ●

●

Miniature Drawn Cup Needle Roller Bearings


( )Miniature one-way clutches with resin pulleys orresin gears are also available

37


Deep Groove Ball Bearings - Standard series

Deep Groove Ball Bearings - Thin section series

Deep Groove Ball Bearings - Narrow-width series

Deep Groove Ball Bearings with Flanges - Standard series

Deep Groove Ball Bearings with Flanges - Thin section series

Deep Groove Ball Bearings with Resin Flanges - FN Bearings

Bearing Dimension TablesCONTENTS

[ Metrie series ]

[ Inch series ]

Deep Groove Ball Bearings

Deep Groove Ball Bearings with Flanges

54

56

38

42

44

46

50

52

1.

2.

3.

4.

5.

6.

1.

2.

1

2

3

4

5

6

7

8

○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○

○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○

○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○

○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○

○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○

○ ○ ○ ○ ○ ○ ○ ○

○ ○ ○ ○ ○

○ ○ ○ ○ ○ ○ ○


1.8

1.8

2.72.3

3.22.83.2

3.2

3.73.33.7

4.24.24.2

4.6

5.25.65.6

6

6.66.67

7

140 000

140 000

130 000100 000

100 000100 00079 000

79 000

79 00075 00076 000

76 00072 00063 000

54 000

65 00063 00054 000

49 000

60 00060 00049 000

43 000

691

ML1204

69/1.5ML1506

692ML2006ML2007602

69/2.5ML2508/1BML2508

693603623633

694604624634

695605625635

　　ー

　　ー

W69/1.5 ZZXWML1506 ZZX

W692 ZZWML2006 ZZXWML2007 ZZXW602 ZZX

W69/2.5 ZZ　　ーWML2508 ZZX

W693 ZZW603 ZZX623 ZZ633 ZZ

694 ZZ604 ZZ624 ZZ634 ZZ

695 ZZ605 ZZ625 ZZ635 ZZ

ー

ー

ーー

ーーー

ー

ーーー

ーーー

ー

ーーー

ー

2RDー2RD2RD

ー

ー

ーー

ーーー

ー

ーーー

ーーー

ー

2RUー2RUー

2RUー2RU2RU

ー

ー

ーー

ーーー

ー

ーーー

ーー2RSー

2RSー2RSー

2RSー2RS2RS

3.2

3.4

3.8 5.2

4.8 5.2 5.8

5.8

5.8 7.2 6.8

6.8 7.8 8.8

11.4

9.810.411.4

14

11.412.414

17

0.1

0.07

0.150.1

0.10.10.15

0.15

0.150.10.1

0.150.150.15

0.2

0.150.20.2

0.3

0.20.20.3

0.3

0.1

0.1

0.1 0.3

0.2 0.3 0.4

0.5

0.4 0.6 0.6

0.6 0.9 1.6

3.0

1.8 2.1 2.9

5.3

2.2 3.5 5.0

8.5

1

1.2

1.5

2

2.5

3

4

5

4

4

56

667

7

788

8910

13

111213

16

131416

19

0.1

0.08

0.150.1

0.150.10.15

0.15

0.150.10.15

0.150.150.15

0.2

0.150.20.2

0.3

0.20.20.3

0.3

ー

ー

2.6 3

3 3 3

3.5

3.5 ー 4

4 5 4

5

4 4 5

5

4 5 5

6

ー

ー

0.150.1

0.10.10.15

0.15

0.15 ー0.1

0.150.150.15

0.2

0.150.20.2

0.3

0.20.20.3

0.3

0.04

0.04

0.060.10

0.100.100.13

0.13

0.110.150.17

0.170.160.23

0.49

0.350.360.49

0.67

0.430.480.67

1.05

0.14

0.16

0.190.33

0.330.330.39

0.39

0.310.430.55

0.550.430.64

1.30

0.960.971.30

1.75

1.101.301.75

2.60

120 000

120 000

110 00086 000

86 00086 00067 000

67 000

66 00063 00064 000

64 00060 00052 000

44 000

54 00053 00044 000

40 000

50 00050 00040 000

35 000

1.6

1.8

22.5

2.32.52.5

2.8

2.52.52.8

334

5

445

5

455

6

ー

ー

ーー

ーーー

ー

ーーー

ーーー

ー

ーーー

ー

45 000ー

36 000

32 000

ー

ー

ーー

ーーー

ー

ーーー

ーー

44 000

ー

44 000ー

39 000

ー

42 000ー

33 000

27 000

BBr

rφD φ r1 r1r1

r11 r1

r1

r1

r1

r1

r1

r1r1

Open type Shielded typeContact

sealed typeNon-contact sealed type

Extremely light contact sealed type

ZZ ZZX ZZL 2RS2RU 2RD

d

B1 B1 B1B1 B1 r

rφD φd

�r

rφD φd

�a

a

a a

a

a

aa

If, however, P0＜Fr , assume P0＝Fr

0.0140.0280.056

0.0840.110.17

0.280.420.56

0.190.220.26

0.280.300.34

0.380.420.44

1 0 0.56

2.301.991.71

1.551.451.31

1.151.041.00

X Y X Ye

P0＝0.6F r＋0.5Fa

P＝XFr＋YFa

≦ e ＞ eC0Fa

FaFr

FaFr

Dynamic equivalent load

Static equivalent load

ML1204, ML1506, ML2006, ML2007, ML2508/1B, and ML2508 correspond to former bearing numbersOB05, OB08, OB13, OB14, OB16, and OB17, respectively

Note 1)

Full-size Drawing

Bearing number Mounting dimensions （Refer.）Mass（g）

Oil lub.

Open type Shielded type Sealed type(min.) (max.) (max.)

da Da raCr Cor

　1）

（mm）

（Open type）

Basic load ratings Limiting speedsBoundary dimensions

d D B B1Grease lub.

Dynamic Static（kN）（mm）

( 2RD ) ( 2RS ) ( )ZXr r1

(min.) ( )ZZX,2RU(min.)

（minー1）

Open type Open type

Deep Groove Ball Bearings [ Metric Series ]

Standard series d 1～5 mm

604

625

633

691

ML1204

ML1506

692

602

ML2508

693

605

38 39


6

7

8

9

151719

1922

171922

2226

192224

28

202426

30

0.20.30.3

0.30.3

0.30.30.3

0.30.3

0.30.30.3

0.3

0.30.30.6

0.6

5 6 6

8 7

5 6 7

8 9

6 7 8

9

6 7 8

10

0.20.30.3

0.30.3

0.30.30.3

0.30.3

0.30.30.3

0.3

0.30.30.6

0.6

0.670.741.05

1.051.35

0.711.051.35

1.351.95

0.911.351.40

1.95

1.051.401.95

2.65

1.751.952.60

2.603.30

1.602.603.30

3.304.55

2.253.303.35

4.55

2.453.354.55

6.00

45 00043 00035 000

40 00031 000

42 00040 00031 000

34 00026 000

39 00034 00028 000

26 000

35 00033 00027 000

24 000

54 00051 00043 000

47 00037 000

50 00047 00037 000

41 00032 000

46 00041 00035 000

32 000

42 00040 00033 000

29 000

696606626ML6019636

697607627ML7022637

698608628638

699609629639

696 ZZ606 ZZ626 ZZML6019 ZZ636 ZZ

697 ZZ607 ZZ627 ZZML7022 ZZ637 ZZ

698 ZZ608 ZZ628 ZZ638 ZZ

699 ZZ609 ZZ629 ZZ639 ZZ

2RD2RD2RDーー

ー2RD2RDーー

2RD2RDー

2RD

2RD2RD2RDー

5 6 6

8 7

5 6 7

8 9

6 7 8

9

6 7 8

10

2RU2RU2RUーー

ー2RU2RUーー

ー2RU2RUー

ー2RU2RUー

2RSー2RSー2RS

2RS2RS2RSーー

2RS2RS2RSー

2RS2RS2RSー

7.6 8 8

7 8

9 9 9

9 9

101010

10

111112.1

13

13.41517

1820

151720

2024

172022

26

182222

26

0.20.30.3

0.30.3

0.30.30.3

0.30.3

0.30.30.3

0.3

0.30.30.3

0.6

3.9 5.8 8.1

9.013

5.3 7.613

1424

7.21218

29

7.51520

35

( ) ( )

41 00039 00032 000

ーー

ー36 00028 000

ーー

35 00031 000 ー

23 000

32 00030 00024 000

ー

32 000 ー27 000

ー23 000

28 00027 00023 000

ーー

27 00023 00022 000

ー

25 00022 00019 000

ー

BBr

rφD φ r1 r1r1

r11 r1

r1

r1

r1

r1

r1

r1r1




ZZ ZZX ZZL 2RS2RU 2RD

d

B1 B1 B1B1 B1 r

rφD φd

�r

rφD φd

�a

a

a a

a

a

aa

Full-size Drawing


Oil lub.


da Da raCr Cor

　2）

（mm）

（Open type）


d D B B1Grease lub.


( 2RD ) ( 2RS ) ( )Zr r1

(min.) ( )ZZ,2RU(min.)

（minー1）

Open type Open type


Values in ( ) do not conform to JIS B 1521Notes 1)

2) ML6019 and ML7022 correspond to former bearing numbers OB47 and OB52, respectively

1）


1）


0.0140.0280.056

0.0840.110.17

0.280.420.56

0.190.220.26

0.280.300.34

0.380.420.44

1 0 0.56

2.301.991.71

1.551.451.31

1.151.041.00

X Y X Ye

P0＝0.6F r＋0.5Fa

P＝XFr＋YFa

≦ e ＞ eC0Fa

FaFr

FaFr



696��

ML7022

698

609

40 41


1

1.5

2

2.5

3

4

5

6

7

8

9

33

4

55

6

678

789

10

8910

11

101213

111314

121416

17

0.070.08

0.1

0.10.1

0.1

0.080.150.1

0.080.10.15

0.15

0.080.10.1

0.15

0.10.150.15

0.10.150.15

0.10.150.2

0.2

ーー

2

2.32.5

2.6

2.53ー

2.534

4

2.534

5

345

345

3.545

5

ーー

0.1

0.10.08

0.1

0.050.15 ー

0.050.080.15

0.1

0.050.080.1

0.15

0.080.10.15

0.080.150.15

0.080.150.2

0.2

0.030.02

0.03

0.060.06

0.06

0.060.110.15

0.110.140.23

0.23

0.120.190.21

0.36

0.220.290.44

0.230.380.51

0.300.420.71

0.66

0.100.08

0.11

0.190.19

0.19

0.190.310.43

0.260.400.64

0.65

0.260.470.50

0.97

0.500.711.10

0.430.821.15

0.570.871.60

1.35

130 000130 000

120 000

98 00098 000

75 000

75 00066 00063 000

64 00061 00059 000

56 000

59 00056 00055 000

53 000

53 00049 00048 000

49 00047 00045 000

47 00044 00042 000

39 000

150 000150 000

140 000

110 000110 000

89 000

89 00079 00075 000

76 00073 00070 000

67 000

70 00067 00065 000

63 000

63 00059 00057 000

59 00055 00054 000

55 00052 00050 000

46 000

681ML1003

68/1.5

682ML2005

68/2.5

ML3006683ML3008

ML4007ML4008684ML4010

ML5008ML5009ML5010685

ML6010ML6012686

ML7011ML7013687

ML8012ML8014688

689

　　ー　　ー

W68/1.5 ZZ

W682 ZZXWML2005 ZZ

W68/2.5 ZZ

WML3006 ZZW683 ZZ　　ー

WML4007 ZZWML4008 ZZW684 ZZWML4010 ZZ

WML5008 ZZWML5009 ZZWML5010 ZZW685 ZZ

WML6010 ZZWML6012 ZZW686 ZZ

WML7011 ZZXWML7013 ZZW687 ZZ


W689 ZZ

ーー

ー

ーー

ー

ーーー

ーーー

ー

ーーー

ー

ーー2RD

ーーー

ーー2RD

2RD

11.5

1.2

1.52

1.8

222.5

222.5

3

22.53

3

2.533.5

2.533.5

2.53.54

4

ーー

ー

ーー

ー

ーーー

ーーー

ー

ーーー

ー

ーーー

ーーー

ーー2RU

2RU

ーー

ー

ーー

ー

ーーー

ーーー

ー

ーーー

ー

ー2RS2RS

ーーー

ーー2RS

ー

1.6 1.6

2.3

2.8 2.6

3.3

3.6 4.2 3.8

4.6 4.8 5.2

5.2

5.6 5.8 5.8

6.2

6.8 7.2 7.2

7.8 8.2 8.2

8.8 9.2 9.6

10.6

2.4 2.4

3.2

4.4 4.2

5.2

5.4 5.8 7.2

6.4 7.2 7.8

8.8

7.4 8.2 9

9.8

9.210.811.8

10.211.812.8

11.212.814.4

15.4

0.050.07

0.1

0.10.07

0.1

0.050.10.1

0.050.080.1

0.1

0.050.080.1

0.15

0.080.10.15

0.080.150.15

0.080.150.2

0.2

0.03 0.05

0.1

0.1 0.1

0.2

0.2 0.3 0.5

0.2 0.4 0.6

1.0

0.3 0.5 0.9

1.0

0.6 1.3 1.8

0.7 1.4 2.0

0.8 1.8 3.2

3.5

( 　 ) ( 　 )

( 　 ) ( 　 )

ーー

ー

ーー

ーー

ーーー

ーーー

ー

ーーー

ー

ーー

43 000

ーーー

ーー

38 000

35 000

ーー

ー

ーー

ーー

ーーー

ーーー

ー

ーーー

ー

ー37 00036 000

ーーー

ーー

28 000

ー

BBr

rφD r1 r1r1

r11 B1 B1 B1B1 1r1 r1 r1r1B r1

r1r1 r1ZZ ZZX ZZL 2RS2RU 2RD

φd




r

rφD φd

�r

rφD φd

�

a

a

a

a a a

a

a

Full-size Drawing


Oil lub.


da Da raCr Cor

　2）

（mm）

（Open type）


d D B B1Grease lub.


( 2RD ) ( 2RS ) ( )Zr r1

(min.) ( )ZZ,2RU(min.)

（minー1）

Open type Open type

Thin section series d 1～9 mm


2) ML1003 and ML2005 correspond to former bearing numbers OB03 and OB11, respectively

1）



0.0140.0280.056

0.0840.110.17

0.280.420.56

0.190.220.26

0.280.300.34

0.380.420.44

1 0 0.56

2.301.991.71

1.551.451.31

1.151.041.00

X Y X Ye

P0＝0.6F r＋0.5Fa

P＝XFr＋YFa

≦ e ＞ eC0Fa

FaFr

FaFr



1）

ML5010

ML6010

ML7011

ML4007

ML4010

681

68 / 1.5

682

68 / 2.5

ML3006

689

ML8014

42 43


44 45

d D B Da ra

2

3

4

5

6

5

78

8910

1113

1315

0.08

0.150.15

0.080.150.15

0.150.2

0.150.2

( )

0.06

0.130.17

0.110.230.35

0.280.43

0.440.60

0.19

0.340.55

0.310.640.96

0.711.10

1.101.50

98 000

66 00064 000

61 00059 00054 000

53 00050 000

48 00045 000

110 000

79 00076 000

73 00070 00065 000

63 00060 000

57 00054 000

ML2005/1B Z

683 Z693/1B Z

ML4008 Z684/1B Z694/1B Z

685/1B Z695/1B Z

686/1B Z696/1B Z

1.6

22.6

22.63

43

33.5

2.6

4.2 4.2

4.8 5.2 5.2

6.2 6.6

7.2 7.6

4.2

5.8 6.8

7.2 7.8 9.8

9.811.4

11.813.4

0.07

0.10.15

0.080.10.15

0.150.2

0.150.2

0.1

0.3 0.5

0.4 0.6 1.8

1.0 2.2

1.8 2.8

( )

（kN）

r 1）（minー1）

Cr Cor

(mm)

Br

rφD φd

r

r�φD φd

�

a a

a

a

Full-size Drawing

Bearing number Mounting dimensions （Refer.）

Mass

（g） Oil lub. Shielded type(min.) (max.) (max.)

da


Grease lub.Dynamic Static

（mm）

(min.)

Narrow-width series d 2～6 mm

Values in ( ) do not conform to JIS B 1521Note 1)


0.0140.0280.056

0.0840.110.17

0.280.420.56

0.190.220.26

0.280.300.34

0.380.420.44

1 0 0.56

2.301.991.71

1.551.451.31

1.151.041.00

X Y X Ye

P0＝0.6F r＋0.5Fa

P＝XFr＋YFa

≦ e ＞ eC0Fa

FaFr

FaFr




ML2005 / 1B Z

683 Z

684 / 1B Z

686 / 1B Z

695 / 1B Z


46 47

1

1.5

2

2.5

3

4

5

4

56

667

7

788

8 910

13

111213

16

131416

19

0.1

0.150.1

0.150.10.15

0.15

0.150.10.15

0.150.150.15

0.2

0.150.20.2

0.3

0.20.20.3

0.3

ー

2.63

333

3.5

3.5ー4

454

5

445

5

455

6

0.14

0.170.33

0.330.330.39

0.39

0.390.550.56

0.570.570.63

1.30

0.960.961.30

1.35

1.101.351.75

2.35

120 000

110 00086 000

86 00086 00067 000

67 000

66 00064 00063 000

60 00060 00061 000

50 000

54 00054 00050 000

47 000

49 00048 00045 000

40 000

F691

F69/1.5MLF1506

F692MLF2006MLF2007F602

F69/2.5MLF2508/1BMLF2508

F693F603F623F633

F694F604F624F634

F695F605F625F635

　　ー

WF69/1.5 ZZWMLF1506 ZZ

WF692 ZZWMLF2006 ZZWMLF2007 ZZWF602 ZZ

WF69/2.5 ZZX　　ーWMLF2508 ZZ

WF693 ZZWF603 ZZF623 ZZF633 ZZ

F694 ZZF604 ZZF624 ZZF634 ZZ


1.6

22.5

2.32.52.5

2.8

2.52.52.8

334

5

445

5

455

6

0.1

0.2 0.4

0.3 0.4 0.5

0.6

0.5 0.7 0.7

0.7 1.0 1.8

3.4

2.0 2.3 3.3

5.7

2.5 3.9 5.4

9.7

ー

0.150.1

0.10.10.15

0.15

0.15ー0.1

0.150.150.15

0.2

0.150.20.2

0.3

0.20.20.3

0.3

0.04

0.050.10

0.100.100.13

0.13

0.130.170.18

0.190.190.22

0.48

0.350.350.48

0.52

0.430.510.67

0.89

140 000

130 000100 000

100 000100 00079 000

79 000

79 00076 00075 000

72 00072 00072 000

60 000

65 00065 00060 000

55 000

59 00057 00054 000

47 000

MLF1506, MLF2006, MLF2007, MLF2508/1B, and MLF2508 correspond to former bearing numbersOBF08, OBF13, OBF14, OBF16, and OBF17, respectively

5

6.5 7.5

7.5 7.2 8.2

8.5

8.5 9.2 9.5

9.510.511.5

15

12.513.515

18

151618

22

ー

0.80.8

0.80.60.6

0.9

0.9ー0.9

0.911

1

111

1

111

1.5

0.5

0.60.6

0.60.60.6

0.7

0.70.60.7

0.70.71

1

111

1

111

1.5

1.8

2.72.3

3.22.83.2

3.2

3.73.53.7

4.24.24.2

4.6

5.25.65.6

6

6.66.67

7

0.1

0.150.1

0.10.10.15

0.15

0.150.10.1

0.150.150.15

0.2

0.150.20.2

0.3

0.20.20.3

0.3

B CBBB

r

r

φD φ φD r1 r1r1

r1 r1r1

1

1 11

1 φD2 φD2 φD2ZZ ZZX ZZL

d

C2 C2C2

rφd

�

a

a

Open type Shielded type

rφd

a

a

d D B B1 r r1Cr Cor

（minー1）（mm）

C2C1

Flange dimensions（mm）

da ra（mm） Full-size Drawing

Bearing number Mounting dimensions

（Refer.）

Mass

（g） Oil lub. Open type Shielded type

（max.）（Open type）



（kN）

(min.)(min.)


Bearings with locating snapring on outer ring are alsoavailable. Consult KOYO

Deep Groove Ball Bearings with Flanges [ Metric Series ]


0.0140.0280.056

0.0840.110.17

0.280.420.56

0.190.220.26

0.280.300.34

0.380.420.44

1 0 0.56

2.301.991.71

1.551.451.31

1.151.041.00

X Y X Ye

P0＝0.6F r＋0.5Fa

≦ e ＞ eC0Fa

FaFr

FaFr



D 1・D 2（min.）

　1）

Note 1)

P＝ XFr＋YFa

F691

MLF1506

MLF2006

MLF2508

F603

F623

F694

F625

F624

F692


48 49

6

7

8

9

151719

22

171922

26

1922

2024

0.20.30.3

0.3

0.30.30.3

0.3

0.30.3

0.30.3

566

7

567

9

67

67

1.352.252.35

3.30

1.602.353.30

4.60

2.253.30

2.453.35

47 00043 00040 000

34 000

42 00040 00034 000

29 000

39 00034 000

37 00032 000

F696F606F626F636

F697F607F627F637

F698F608

F699F609



F698 ZZF608 ZZ

F699 ZZF609 ZZ

566

7

567

9

67

67

4.3 6.3 9.2

14

5.8 8.714

26

8.313

8.716

0.20.30.3

0.3

0.30.30.3

0.3

0.30.3

0.30.3

0.520.840.89

1.35

0.710.891.35

1.95

0.911.35

1.051.45

55 00052 00047 000

41 000

50 00047 00041 000

35 000

46 00041 000

44 00038 000

171922

25

192225

29

2225

2327

1.21.21.5

1.5

1.21.51.5

2

1.51.5

1.51.5

1.21.21.5

1.5

1.21.51.5

2

1.51.5

1.51.5

7.6 8 8

8

9 9 9

9

1010

1111

0.2 0.3 0.3

0.3

0.3 0.3 0.3

0.3

0.3 0.3

0.3 0.3

B CBBB

r

r

φD φ φD r1 r1r1

r1 r1r1

1

1 11


d

C2 C2C2

rφd

�

a

a


rφd

a

a

d D B B1 r r1Cr Cor


C2C1




（Refer.）

Mass





（kN）

(min.)(min.)



F696

F697

F609



0.0140.0280.056

0.0840.110.17

0.280.420.56

0.190.220.26

0.280.300.34

0.380.420.44

1 0 0.56

2.301.991.71

1.551.451.31

1.151.041.00

X Y X Ye

P0＝0.6F r＋0.5Fa

≦ e ＞ eC0

FaFa

Fr

Fa

Fr



D 1・D 2（min.）

P＝ XFr＋YFa


1

1.5

2

2.5

3

4

5

6

7

8

9

3

4

55

6

678

789

10

8910

11

101213

111314

121416

17

0.07

0.1

0.10.1

0.1

0.080.150.1

0.080.10.15

0.15

0.080.10.1

0.15

0.10.150.15

0.10.150.15

0.10.150.2

0.2

ー

2

2.32.5

2.6

2.53 ー

2.534

4

2.534

5

345

345

3.545

5

ー

0.1

0.10.08

0.1

0.050.15ー

0.050.080.15

0.1

0.050.080.1

0.15

0.080.10.15

0.080.150.15

0.080.150.2

0.2

0.03

0.03

0.050.05

0.07

0.070.110.14

0.110.140.23

0.27

0.090.170.17

0.28

0.220.290.44

0.200.280.51

0.270.420.59

0.66

0.10

0.11

0.170.17

0.21

0.210.310.40

0.250.400.64

0.71

0.220.430.43

0.71

0.500.711.10

0.460.541.15

0.540.871.25

1.35

130 000

120 000

99 00099 000

69 000

69 00065 00061 000

63 00061 00059 000

56 000

59 00057 00057 000

53 000

53 00049 00048 000

49 00046 00045 000

47 00044 00042 000

39 000

150 000

140 000

120 000120 000

82 000

82 00078 00072 000

75 00072 00070 000

66 000

70 00067 00067 000

63 000

63 00059 00057 000

59 00055 00054 000

55 00052 00050 000

46 000

1

1.2

1.52

1.8

222.5

222.5

3

22.53

3

2.533.5

2.533.5

2.53.54

4

1.6

2.3

2.8 2.8

3.3

3.6 4.2 4.0

4.6 4.8 5.2

5.2

5.6 5.8 5.8

6.2

6.8 7.2 7.2

7.8 8.2 8.2

8.8 9.2 9.6

10.6

0.05

0.1

0.10.07

0.1

0.050.10.1

0.050.080.1

0.1

0.050.080.1

0.15

0.080.10.15

0.080.150.15

0.080.150.2

0.2

( ) ( )

( )( )

F681

F68/1.5

F682MLF2005

F68/2.5

MLF3006F683MLF3008

MLF4007MLF4008F684MLF4010

MLF5008MLF5009MLF5010F685

MLF6010MLF6012F686

MLF7011MLF7013F687

MLF8012MLF8014F688

F689

3.8

5

6.1 6.2

7.1

7.2 8.1 9.2

8.2 9.210.3

11.2

9.210.211.2

12.5

11.213.215

12.214.216

13.215.618

19

ー　

5

6.1 6.2

7.1

7.2 8.1 ー　

8.2 9.210.3

11.6

9.210.211.6

12.5

11.213.615

12.214.616

13.615.618

19

　　－

WF68/1.5 ZZ

WF682 ZZWMLF2005 ZZ

WF68/2.5 ZZ

WMLF3006 ZZWF683 ZZ　　－

WMLF4007 ZZXWMLF4008 ZZWF684 ZZWMLF4010 ZZ

WMLF5008 ZZXWMLF5009 ZZXWMLF5010 ZZWF685 ZZ

WMLF6010 ZZXWMLF6012 ZZWF686 ZZ



WF689 ZZ

0.03

0.1

0.10.2

0.2

0.20.40.6

0.30.50.7

1.1

0.40.61.0

1.1

0.71.42.1

0.81.52.4

0.92.03.6

3.9

ー

0.6

0.6 0.6

0.8

0.6 0.8 ー

0.6 0.6 1

0.8

0.6 0.6 0.8

1

0.6 0.8 1.1

0.6 0.8 1.1

0.8 0.8 1.1

1.1

0.3

0.4

0.5 0.6

0.5

0.6 0.5 0.6

0.6 0.6 0.6

0.6

0.6 0.6 0.6

0.8

0.6 0.6 1

0.6 0.6 1

0.6 0.8 1

1

B CB

r

r

φD φ φD r1

r1

1

1

1 φD2ZZ ZZX ZZL

d

C2 B

r1

r11

φD2

C2B

r1

r11

φD2

C2

rφd

�

a

a


r�φda

a

d D B B1 r r1Cr Cor


D1 C2C1




（Refer.）

Mass





（kN）

(min.)(min.)D2

Thin section series d 1～9 mm


2) MLF2005 and WMLF2005 ZZ correspond to former bearing numbers OBF11 and WOBF11 ZZ, respectively




0.0140.0280.056

0.0840.110.17

0.280.420.56

0.190.220.26

0.280.300.34

0.380.420.44

1 0 0.56

2.301.991.71

1.551.451.31

1.151.041.00

X Y X Ye

P0＝0.6F r＋0.5Fa

P＝XFr＋YFa

≦ e ＞ eC0Fa

FaFr

FaFr



1） 1）

（min.）

　2）

F68 / 1.5

F68 / 2.5

F681

F682

F683

F685

F688

F689

MLF4008

MLF6010

MLF4010

50 51


d 3～8 mmFN Bearings

3

4

5

6

7

8

78

89

910

101213

1113

121416

0.80.9

0.61

0.60.8

0.60.81.1

0.60.8

0.80.81.1

0.15 0.15

0.08 0.15

0.08 0.1

0.08 0.1 0.15

0.08 0.15

0.08 0.15 0.2

34

34

34

345

34

3.545

8.1 9.5

9.210.3

10.211.6

11.213.615

12.214.6

13.615.618

WFN683 ZZWFN693 ZZ

WMLFN4008 ZZWFN684 ZZ

WMLFN5009 ZZWMLFN5010 ZZ

WMLFN6010 ZZWMLFN6012 ZZWFN686 ZZ

WMLFN7011 ZZWMLFN7013 ZZ

WMLFN8012 ZZWMLFN8014 ZZWFN688 ZZ

0.310.55

0.400.64

0.380.50

0.500.711.10

0.430.82

0.570.871.60

66 00064 000

61 00059 000

56 00055 000

53 00049 00048 000

49 00047 000

47 00044 00042 000

0.50.9

0.61.0

0.71.2

0.81.72.6

0.92.1

1.12.13.9

0.110.17

0.130.23

0.170.21

0.220.290.44

0.230.38

0.300.420.71

4.24.2

4.85.2

5.85.8

6.87.27.2

7.88.2

8.89.29.6

0.10.15

0.080.1

0.080.1

0.080.10.15

0.080.15

0.080.150.2

2. Pull-out Strength of Flange

These values for the pull-out strength of the flange arevalid when an axial load is applied evenly to the wholecircumference of the flange. If the load is applied locally,the pull-out strength may decrease to approximately 10% of the C 0 value (C 0 denotes the basic static load ratingof bearing).

1. Application Conditions and Environment

Condition / Environment Operating range

Resistanceto axial load

65 % or less of C0

50 % or less of C0

130℃ max.

－30℃ min.

95 % RH max.

＜ 50℃

≧ 50℃

Heat resistance

Low temperature resistance

Moisture resistance

Pul

l-out

str

engt

h of

flan

ge

Temperature, ℃

B C

r

r

φD φ φD

1

1dr

φda

a

1.5

1

0.65

0.5

010 20 30 40 50 100 200

d D B ra（kN）

r （minー1）Cr Cor

(mm) Full-size Drawing

Bearing number Mounting dimensions （Refer.）

Mass

（g）Shielded type(min.) (max.)

da

Basic load ratings Limitingspeeds

Boundary dimensions


（mm）

(min.)

Flange dimensions

(mm)1）

D1 C12）

The tolerance for D1 is from + 0.125 to - 0.050 mm. This does not apply to the portion formed by the molding gateNotes 1) 2) The tolerance for C1 is from 0 to - 0.050 mm

Performance

Remark:

（）Assume that the basic static

load rating of bearing, C0 , is 1

Deep Groove Ball Bearings with Resin Flanges [ Metric Series ]


0.0140.0280.056

0.0840.110.17

0.280.420.56

0.190.220.26

0.280.300.34

0.380.420.44

1 0 0.56

2.301.991.71

1.551.451.31

1.151.041.00

X Y X Ye

P0＝0.6F r＋0.5Fa

P＝XFr＋YFa

≦ e ＞ eC0Fa

FaFr

FaFr



d 3～8 mm

Remark: Consult KOYO for flange dimensions and shapes which are not listed above

Note:

C0 denotes the basic static load rating of bearing

WFN683

WMLFN4008

WMLFN6010

WMLFN8012

WMLFN5009

WMLFN7011

52 53


(min.)d D B B 1 r1Shielded type

1.016

1.191

1.397

1.984

2.380

3.175

3.967

4.762

6.350

9.525

Cr Cor0.02

0.04

0.06

0.10

0.060.17

0.110.150.23

0.230.49

0.15

0.120.270.49

0.200.440.62

1.05

1.40

0.08

0.14

0.21

0.33

0.190.55

0.310.430.64

0.641.30

0.36

0.260.711.30

0.421.101.50

2.80

3.35

130 000

120 000

110 000

86 000

98 00064 000

66 00063 00059 000

59 00050 000

61 000

59 00056 00050 000

53 00048 00044 000

40 000

33 000

150 000

140 000

130 000

100 000

110 00076 000

79 00075 00070 000

70 00060 000

73 000

70 00066 00060 000

63 00057 00052 000

47 000

40 000

OB63

OB65

OB67

OB69

OB71OB72

OB74OB75OB76EE0EE1/2

OB79

OB81OB82EE1

OB87OB88EE11/2EE2

EE3

ー

WOB65 ZZX

WOB67 ZZX

WOB69 ZZX

WOB71 ZZXWOB72 ZZX

WOB74 ZZWOB75 ZZWOB76 ZZXEE0 ZZEE1/2 ZZX

WOB79 ZZX

WOB81 ZZXOB82 ZZXEE1S ZZ

OB87 ZZWOB88 ZZXEE11/2 ZZEE2S ZZ

EE3S ZZ

3.175

3.967

4.762

6.350

4.7627.938

6.3507.9389.525

9.52512.700

7.938

7.9389.52512.700

9.52512.70015.875

19.050

22.225

0.05

0.1

0.1

0.3

0.10.6

0.20.60.9

1.32.6

0.5

0.40.72.1

0.51.44.3

7.2

9.0

（minー1）

mm inch mm inch mm inch mm inch mm inch mm inch

0.0400

0.0469

0.0550

0.0781

0.0937

0.1250

0.1562

0.1875

0.2500

0.3750

0.1250

0.1562

0.1875

0.2500

0.18750.3125

0.25000.31250.37500.37500.5000

0.3125

0.31250.37500.5000

0.37500.50000.62500.7500

0.8750

1.191

1.588

1.984

2.380

1.5882.779

2.3802.7792.779

3.9674.366

2.779

2.7793.1753.967

3.1753.1754.978

5.558

5.558

0.0469

0.0625

0.0781

0.0937

0.06250.1094

0.09370.10940.10940.15620.1719

0.1094

0.10940.12500.1562

0.12500.12500.19600.2188

0.2188

ー　

2.380

2.779

3.571

2.3803.571

2.7793.5713.571

3.9674.366

3.175

3.1753.1754.978

3.1754.7624.978

7.142

7.142

ー　

0.0937

0.1094

0.1406

0.09370.1406

0.10940.14060.14060.15620.1719

0.1250

0.12500.12500.1960

0.12500.18750.19600.2812

0.2812

0.08

0.08

0.08

0.08

0.080.127

0.080.080.127

0.30.3

0.08

0.080.080.3

0.080.1270.3

0.4

0.4

0 .003

0 .003

0 .003

0 .003

0 .0030 .005

0 .0030 .0030 .0050 .0120 .012

0 .003

0 .0030 .0030 .012

0 .0030 .0050 .0120 .016

0 .016

ー

0.08

0.08

0.08

0.080.08

0.080.080.08

0.30.3

0.08

0.080.080.3

0.080.080.3

0.4

0.4

ー　

0.003

0 .003

0 .003

0 .0030 .003

0 .0030 .0030 .0030 .0120 .012

0 .003

0 .0030 .0030 .012

0 .0030 .0030 .0120 .016

0 .016

r

OB, EEシリーズ

EE2

EE0

OB63

OB65

OB67

OB69

OB76

OB79

OB87

OB71

OB82

BBBBr

rφD φ r1 r1r1

r11 1 1 r1r1

ZZ ZZX ZZL

d


Full-size Drawing

Boundary dimensions

(min.)

Basic load ratings

Dynamic Static Greaselub.

Oil lub.

Limiting speeds

Open type

Bearing number （Refer.）Mass（g）

（Open type）

OB and EE series d 1.016～9.525 mmDeep Groove Ball Bearings [ Inch Series ]


0.0140.0280.056

0.0840.110.17

0.280.420.56

0.190.220.26

0.280.300.34

0.380.420.44

1 0 0.56

2.301.991.71

1.551.451.31

1.151.041.00

X Y X Ye

P0＝0.6F r＋0.5Fa

P＝XFr＋YFa

≦ e ＞ eC0Fa

FaFr

FaFr



（kN）

54 55


56 57

d D B B 1 r 1

1.191

1.397

1.984

2.380

3.175

3.967

4.762

6.350

7.938

9.525

Cr Cor0.03

0.07

0.10

0.060.17

0.110.180.23

0.23

0.15

0.150.270.48

0.170.440.62

0.28

1.40

0.11

0.23

0.28

0.190.55

0.310.560.64

0.64

0.36

0.360.711.30

0.371.101.50

0.54

3.35

120 000

110 000

67 000

97 00064 000

67 00063 00059 000

59 000

59 000

59 00056 00050 000

53 00048 00044 000

46 000

33 000

140 000

130 000

80 000

110 00076 000

80 00075 00070 000

70 000

71 000

71 00066 00060 000

63 00057 00052 000

55 000

40 000

OBF65

OBF67

OBF69

OBF71OBF72

OBF74OBF75OBF76OBF77

OBF79

OBF81OBF82OBF84

OBF87OBF88OBF89

OBF92

OBF93

WOBF65 ZZX

WOBF67 ZZX

WOBF69 ZZX

WOBF71 ZZXWOBF72 ZZX

WOBF74 ZZXWOBF75 ZZWOBF76 ZZXOBF77 ZZX

WOBF79 ZZX

WOBF81 ZZXOBF82 ZZXOBF84 ZZ

OBF87 ZZXWOBF88 ZZXOBF89 ZZ

OBF92 ZZX

WOBF93 ZZ

3.967

4.762

6.350

4.7627.938

6.3507.9389.525

9.525

7.938

7.9389.52512.700

9.52512.70015.875

12.700

22.225

0.1

0.2

0.4

0.1 0.7

0.3 0.7 1.0

1.5

0.6

0.5 0.8 2.8

0.6 1.6 5.8

1.8

12　　

（kN）

mm inch mm inch mm inchmm inch mm inchmm inch

0.0469

0.0550

0.0781

0.0937

0.1250

0.1562

0.1875

0.2500

0.3125

0.3750

0.1562

0.1875

0.2500

0.18750.3125

0.25000.31250.37500.3750

0.3125

0.31250.37500.5000

0.37500.50000.6250

0.5000

0.8750

1.588

1.984

2.380

1.5882.779

2.3802.7792.779

3.967

2.779

2.7793.1754.978

3.1753.1754.978

3.967

5.558

0.0625

0.0781

0.0937

0.06250.1094

0.09370.10940.10940.1562

0.1094

0.10940.12500.1960

0.12500.12500.1960

0.1562

0.2188

2.380

2.779

3.571

2.3803.571

2.7793.5713.571

3.967

3.175

3.1753.1754.978

3.1754.7624.978

3.967

7.142

0.0937

0.1094

0.1406

0.09370.1406

0.10940.14060.14060.1562

0.1250

0.12500.12500.1960

0.12500.18750.1960

0.1562

0.2812

0.08

0.08

0.08

0.080.127

0.080.080.127

0.3

0.08

0.080.080.3

0.080.1270.3

0.127

0.4

0.003

0.003

0.003

0.0030.005

0.0030.0030.0050.012

0.003

0.0030.0030.012

0.0030.0050.012

0.005

0.016

0.08

0.08

0.08

0.080.08

0.080.080.08

0.3

0.08

0.080.080.3

0.080.080.3

0.08

0.4

0.003

0.003

0.003

0.0030.003

0.0030.0030.0030.012

0.003

0.0030.0030.012

0.0030.0030.012

0.003

0.016

r

mm inchmm inch mm inchC 1 C 2D 1・ D 2

5.156

5.944

7.518

5.9449.119

7.5189.11910.719

11.176

9.119

9.11910.71914.351

10.71913.89417.526

13.894

24.613

0 .203

0 .234

0 .296

0 .2340 .359

0 .2960 .3590 .4220 .440

0 .359

0 .3590 .4220 .565

0 .4220 .5470 .690

0 .547

0 .969

0.330

0.584

0.584

0.4570.584

0.5840.5840.584

0.762

0.584

0.5840.5841.067

0.5840.5841.067

0.787

1.575

0.013

0.023

0.023

0.0180.023

0.0230.0230.0230.030

0.023

0.0230.0230.042

0.0230.0230.042

0.031

0.062

0.787

0.787

0.787

0.7870.787

0.7870.7870.787

0.762

0.914

0.9140.7871.067

0.9141.1431.067

0.787

1.575

0 .031

0 .031

0 .031

0 .0310 .031

0 .0310 .0310 .0310 .030

0 .036

0 .0360 .0310 .042

0 .0360 .0450 .042

0 .031

0 .062

Flange dimensions

OBF65

OBF92

OBF87

OBF84

OBF79

OBF76

OBF72

OBF71

OBF69

OBF67

OBF93

B CBBB

r

r

φD φ φD r1 r1r1

r1 r1r1

1

1 11


d

C2 C2C2


Full-size Drawing

Boundary dimensions

(min.) (min.)

Basic load ratings

Dynamic Static

（minー1）Grease

lub.Oil

lub.

Limiting speeds Bearing number

Shieldedtype

Opentype

（Refer.）Mass（g）

（Open type）

OBF series d 1.191～9.525 mm


Deep Groove Ball Bearings with Flanges [ Inch Series ]


0.0140.0280.056

0.0840.110.17

0.280.420.56

0.190.220.26

0.280.300.34

0.380.420.44

1 0 0.56

2.301.991.71

1.551.451.31

1.151.041.00

X Y X Ye

P0＝0.6F r＋0.5Fa

P＝XFr＋YFa

≦ e ＞ eC0Fa

FaFr

FaFr



58

(1) Metric Series, Open Type

1

1.2

1.5

2

2.5

3

4

5

681ML1003691

ML1204

68 / 1.569 / 1.5ML1506

682ML2005692

ML2006ML2007602

68 / 2.569 / 2.5ML2508 / 1B

ML2508

ML3006683ML3008

693603623

633

ML4007ML4008684

ML4010694604

624634

ML5008ML5009ML5010

685695605

625635

681MR31691

MR41 X

681 X691 X601 X

682MR52692

MR62MR72602

682 X692 XMR82 X

602 X

MR63683MR83

693603623

633

MR74MR84684

MR104694604

624634

MR85MR95MR105

685695605

625635

L - 310L - 310W51R - 410

R - 412

L - 415R - 515R - 615

L - 520L - 520W02R - 620

R - 620W52R - 720Y52R - 720

L - 625R - 725R - 825Y52

R - 825

L - 630L - 730R - 830Y52

R - 830R - 930R - 1030

　ー

L - 740L - 840L - 940

L - 1040R - 1140R - 1240

R - 1340R - 1640

L - 850L - 950L - 1050

L - 1150R - 1350R - 1450

R - 1650R - 1950

6

7

8

9

ML6010ML6012686

696606626

636

ML7011ML7013687

697607627

637

ML8012ML8014688

698608628

638

689699609

629639

MR106MR126686

696606626

636

MR117MR137687

697607627

637

MR128MR148688

698608628

638

689699609

629639

L - 1060L - 1260L - 1360

R - 1560R - 1760R - 1960

ー

L - 1170L - 1370L - 1470

ーR - 1970R - 2270

ー

L - 1280L - 1480L - 1680

R - 1980R - 2280ー

ー

L - 1790L - 2090ー

ーー

KOYO NSK NMB KOYO NSK NMB

Supplementary Table 1 Bearing Number Correspondence Table

Bore diameter

（mm）Bore diameter

（mm）

Supplementary Table 1 (1) Bearing Number Correspondence Table

59


1.5

2

2.5

3

4

5

6

691 XZZ601 XZZS

682 ZZMR52 ZZ692 ZZ

MR62 ZZSMR72 ZZS602 ZZS

682 XZZS692 XZZ602 XZZS

MR63 ZZ683 ZZ693 ZZ

623 ZZ633 ZZ

MR74 ZZSMR84 ZZ684 ZZ

MR104 ZZ694 ZZ604 ZZ

624 ZZ634 ZZ

MR85 ZZSMR95 ZZSMR105 ZZ

685 ZZ695 ZZ605 ZZ

625 ZZ635 ZZ


696 ZZ606 ZZ626 ZZ

636 ZZ

R - 515 ZZR - 615 ZZ

L - 520 ZZL - 520 ZZW52R - 620 ZZ

R - 620ZZY52R - 720ZZY03R - 720 ZZ

L - 625 ZZR - 725 ZZR - 825 ZZ

L - 630 ZZL - 730 ZZR - 830 ZZ

R - 1030 ZZ　　ー

L - 740X2 ZZL - 840 ZZL - 940 ZZ

L - 1040 ZZR - 1140 ZZR - 1240 ZZ

R - 1340 ZZR - 1640 ZZ

L - 850 ZZL - 950X2 ZZL - 1050 ZZ

L - 1150 ZZR - 1350 ZZR - 1450 ZZ

R - 1650 ZZR - 1950 ZZ

L - 1060 ZZL - 1260 ZZL - 1360 ZZ

R - 1560 ZZR - 1760 ZZR - 1960 ZZ

　　ー

7

8

9

WML7011 ZZXWML7013 ZZW687 ZZ

697 ZZ607 ZZ627 ZZ

637 ZZ


698 ZZ608 ZZ628 ZZ

638 ZZ

W689 ZZ699 ZZ609 ZZ

629 ZZ639 ZZ

MR117 ZZSMR137 ZZS687 ZZ

697 ZZ607 ZZ627 ZZ

637 ZZ


698 ZZ608 ZZ628 ZZ

638 ZZ

689 ZZ699 ZZ609 ZZ

629 ZZ639 ZZ

L - 1170 ZZL - 1370 ZZL - 1470 ZZ

ーR - 1970 ZZR - 2270 ZZ

ー

L - 1280 ZZL - 1480 ZZL - 1680 ZZ

R - 1980 ZZR - 2280 ZZ

ー

ー

L - 1790 ZZL - 2090 ZZ

ー

ーー


W69 / 1.5 ZZXWML1506 ZZX

W682 ZZXWML2005 ZZW692 ZZ

WML2006 ZZXWML2007 ZZXW602 ZZX

W68 / 2.5 ZZW69 / 2.5 ZZWML2508 ZZX

WML3006 ZZW683 ZZW693 ZZ

623 ZZ633 ZZ


WML4010 ZZ694 ZZ604 ZZ

624 ZZ634 ZZ

WML5008 ZZWML5009 ZZWML5010 ZZ

W685 ZZ695 ZZ605 ZZ

625 ZZ635 ZZ


696 ZZ606 ZZ626 ZZ

636 ZZ

ZX or Z ZS or Z Z

Bore diameter

（mm）

Bore diameter

（mm）

Code of single-shielded type

(2) Metric Series, Shielded Type


60

1

1.5

2

2.5

3

4

5

F681F691

F68 / 1.5F69 / 1.5MLF1506

F682MLF2005F692

MLF2006MLF2007F602

F68 / 2.5F69 / 2.5MLF2508 / 1B

MLF2508

MLF3006F683MLF3008

F693F603F623

MLF4007MLF4008F684

MLF4010F694F604

F624F634

MLF5008MLF5009MLF5010

F685F695F605

F625F635

F681F691

F681XF691XF601X

F682MF52F692

MF62MF72F602

F682XF692XMF82X

F602X

MF63F683MF83

F693F603F623

MF74MF84F684

MF104F694F604

F624F634

MF85MF95MF105

F685F695F605

F625F635

LF - 310RF - 410

LF - 415RF - 515RF - 615

LF - 520　ーRF - 620

RF - 620W52RF - 720Y52RF - 720

LF - 625RF - 725RF - 825Y52

RF - 825

LF - 630LF - 730RF - 830Y52

RF - 830RF - 930RF-1030

LF - 740LF - 840LF - 940

LF - 1040RF - 1140RF - 1240

RF - 1340RF - 1640

LF - 850LF - 950LF - 1050

LF - 1150RF - 1350RF - 1450

RF - 1650RF - 1950

6

7

8

9

MLF6010MLF6012F686

F696F606F626

MLF7011MLF7013F687

F697F607F627

MLF8012MLF8014F688

F698F608

F689F699

MF106MF126F686

F696F606F626

MF117MF137F687

F697F607F627

MF128MF148F688

F698F608

F689F699

LF - 1060LF - 1260LF - 1360

RF - 1560RF - 1760RF - 1960

LF - 1170LF - 1370LF - 1470

ーー

RF - 2270

LF - 1280LF - 1480LF - 1680

RF - 1980RF - 2280

LF - 1790ー

KOYO NSK NMB KOYO NSK NMBBore diameter

（mm）Bore diameter

（mm）


(3) Metric Series, Flanged Type


61


1.5

2

2.5

3

4

5

6

F691 XZZF601 XZZS

F682 ZZMF52 ZZSF692 ZZ

MF72 ZZF602 ZZS

F682 XZZSF692 XZZF602 XZZS

MF63 ZZSF683 ZZF693 ZZ

F623 ZZ

MF74 ZZSMF84 ZZF684 ZZ

MF104 ZZF694 ZZF604 ZZ

F624 ZZF634 ZZ

MF85 ZZSMF95 ZZSMF105 ZZ

F685 ZZF695 ZZF605 ZZ

F625 ZZF635 ZZ



RF - 515 ZZRF - 615 ZZ

LF - 520 ZZ　　ーRF - 620 ZZ

RF - 720Y03RF - 720 ZZ

LF - 625 ZZRF - 725 ZZRF - 825 ZZ

LF - 630 ZZLF - 730 ZZRF - 830 ZZ

RF - 1030 ZZ

LF - 740 ZZLF - 840 ZZLF - 940 ZZ

LF - 1040 ZZRF - 1140 ZZRF - 1240 ZZ

RF - 1340 ZZRF - 1640 ZZ

LF - 850 ZZLF - 950 ZZLF - 1050 ZZ

LF - 1150 ZZRF - 1350 ZZRF - 1450 ZZ

RF - 1650 ZZRF - 1950 ZZ

LF - 1060 ZZLF - 1260 ZZLF - 1360 ZZ

RF - 1560 ZZRF - 1760 ZZ　　ー

7

8

9




F698 ZZF608 ZZ

WF689 ZZF699 ZZ

MF117 ZZSMF137 ZZSF687 ZZ



F698 ZZF608 ZZ

F689 ZZF699 ZZ

LF - 1170 ZZLF - 1370 ZZLF - 1470 ZZ

ーー

RF - 2270 ZZ

LF - 1280 ZZLF - 1480 ZZLF - 1680 ZZ

ーRF - 2280 ZZ

LF - 1790 ZZー


WF69 / 1.5 ZZWMLF1506 ZZ

WF682 ZZWMLF2005 ZZWF692 ZZ

WMLF2007 ZZWF602 ZZ

WF68 / 2.5 ZZWF69 / 2.5 ZZXWMLF2508 ZZ

WMLF3006 ZZWF683 ZZWF693 ZZ

F623 ZZ


WMLF4010 ZZF694 ZZF604 ZZ

F624 ZZF634 ZZ

WMLF5008 ZZXWMLF5009 ZZXWMLF5010 ZZ

WF685 ZZF695 ZZF605 ZZ

F625 ZZF635 ZZ



Bore diameter

（mm）

Bore diameter

（mm）

ZX or Z ZS or Z ZCode of single-shielded type

(4) Metric Series, Flanged, and Shielded Type


62


1.0161.1911.3971.9842.380

3.175

3.9674.762

6.350

7.9389.525

OB63

OB65

OB67

OB69

OB71OB72

OB74OB75OB76

EE0EE1/2

OB79

OB81OB82EE1

OB87OB88EE11/2

EE2

OB92

EE3

KOYO NSK NMB BARDEN MPB

R 09

R 0

R 1

R 1 - 4

R 133R 1 - 5

R 144R 2 - 5R 2 - 6

R 2R 2A

R 155

R 156R 166R 3

R 168R 188R 4

R 4A

R 1810

R 6

RI - 2

RI - 21/2

RI - 3

RI - 4

RI - 3332RI - 5

RI - 418RI - 518RI - 618

R - 2　ー

RI - 5532

RI - 5632RI - 6632R - 3

RI - 614RI - 814R - 4

RI - 1214

RI - 8516

RI - 1438

　ー

R 0

R 1

R 1 - 4

R 133R 1 - 5

R 144R 2 - 5R 2 - 6

R 2R 2A

R 155

R 156R 166R 3

R 168R 188R 4

R 4A

R 1810

R 6

2 C

21/2 C

3 C

4 C

3332 C5 C

418 C518 C618 C

R 2 CR 2A C

5532 C

5632 C6316 CR 3 C

614 C814 CR 4 C

R 4AR

8516 C

R 6 R

Bore diameter

（mm）

1.1911.3971.9842.380

3.175

3.9674.762

6.350

7.9389.525

WOB65 ZZX

WOB67 ZZX

WOB69 ZZX

WOB71 ZZXWOB72 ZZX

WOB74 ZZWOB75 ZZWOB76 ZZX

EE0 ZZEE1/2 ZZX

WOB79 ZZX

WOB81 ZZXOB82 ZZXEE1S ZZ

OB87 ZZWOB88 ZZXEE11/2 ZZ

EE2S ZZ

OB92 ZZX

EE3S ZZ


R 0 ZZS

R 1 ZZS

R 1 - 4 ZZS

R 133 ZZSR 1 - 5 ZZS

R 144 ZZR 2 - 5 ZZR 2 - 6 ZZS

R 2 ZZR 2A ZZ

R 155 ZZS

R 156 ZZSR 166 ZZR 3 ZZ

R 168 ZZSR 188 ZZR 4 ZZ

R 4A ZZ

R 1810 ZZS

R 6 ZZ

RI - 21/2 ZZ

RI - 3 ZZ

RI - 4 ZZ

RI - 3332 ZZRI - 5 ZZ

RI - 418 ZZRI - 518 ZZRI - 618 ZZ

R - 2 ZZ　　ー

RI - 5532 ZZ

RI - 5632 ZZRI - 6632 ZZR - 3 ZZ

RI - 614 ZZRI - 814 ZZR - 4 ZZ

RI - 1214 ZZ

RI - 8516 ZZ

RI - 1438 ZZ

R 0 SS

R 1 SS

R 1 - 4 SS

R 133 SSR 1 - 5 SS

R 144 SSR 2-5 SSR 2-6 SS

R 2 SSR 2A SS

R 155 SS

R 156 SSR 166 SSR 3 SS

R 168 SSR 188 SSR 4 SS

R 4A SS

R 1810 SS

R 6 SS

21/2 CHH

3 CHH

4 CHH

3332 CHH5 CHH

418 CHH518 CHH618 CHH

R 2 CHHR 2A CHH

5532 CHH

5632 CHH6316 CHHR 3 CHH

614 CHH814 CHHR 4 CHH

R 4A RHH

8516 CHH

R 6 RHH

Bore diameter（mm）

Op

en T

ype

Sh

ield

ed T

ype

(5) Inch Series


63


1.1911.3971.9842.380

3.175

3.9674.762

6.350

7.9389.525

OBF65

OBF67

OBF69

OBF71OBF72

OBF74OBF75OBF76

OBF77

OBF79

OBF81OBF82OBF84

OBF87OBF88OBF89

OBF92

OBF93


FR 0

FR 1

FR 1 - 4

FR 133FR 1 - 5

FR 144FR 2 - 5FR 2 - 6

FR 2

FR 155

FR 156FR 166FR 3

FR 168FR 188FR 4

FR 1810

FR 6

RIF - 21/2

RIF - 3

RIF - 4

RIF - 3332RIF - 5

RIF - 418RIF - 518RIF - 618

RF - 2

RIF - 5532

RIF - 5632RIF - 6632　　ー

RIF - 614RIF - 814RF - 4

RIF - 8516

　　ー

FR 0

FR 1

FR 1 - 4

FR 133FR 1 - 5

FR 144FR 2 - 5FR 2 - 6

FR 2

FR 155

FR 156FR 166FR 3

FR 168FR 188FR 4

FR 1810

　　ー

21/2 FC

3 FC

4 FC

3332 FC5 FC

418 FC518 FC618 FC

R2 FC

5532 FC

5632 FC6316 FC　　ー

614 FC814 FCR 4 FC

8516 FC

　　ー

1.1911.3971.9842.380

3.175

3.9674.762

6.350

7.9389.525

WOBF65 ZZX

WOBF67 ZZX

WOBF69 ZZX

WOBF71 ZZXWOBF72 ZZX

WOBF74 ZZXWOBF75 ZZWOBF76 ZZX

WOBF77 ZZX

WOBF79 ZZX

WOBF81 ZZXWOBF82 ZZXWOBF84 ZZ

WOBF87 ZZXWOBF88 ZZXWOBF89 ZZ

OBF92 ZZX

WOBF93 ZZ


FR 0 ZZS

FR 1 ZZS

FR 1 - 4 ZZS

FR 133 ZZSFR 1 - 5 ZZS

FR 144 ZZFR 2 - 5 ZZFR 2 - 6 ZZS

FR 2 ZZ

FR 155 ZZS

FR 156 ZZSFR 166 ZZFR 3 ZZ

FR 168 ZZSFR 188 ZZFR 4 ZZ

FR 1810 ZZS

FR 6 ZZ

RIF - 21/2 ZZ

RIF - 3 ZZ

RIF - 4 ZZ

RIF - 3332 ZZRIF - 5 ZZ

RIF - 418 ZZRIF - 518 ZZRIF - 618 ZZ

RF - 2 ZZ

RIF - 5532 ZZ

RIF - 5632 ZZRIF - 6632 ZZRF - 3 ZZ

RIF - 614 ZZRIF - 814 ZZRF - 4 ZZ

RIF - 8516 ZZ

RIF - 1438 ZZ

FR 0 SS

FR 1 SS

FR 1 - 4 SS

FR 133 SSFR 1 - 5 SS

FR 144 SSFR 2 - 5 SSFR 2 - 6 SS

FR 2 SS

FR 155 SS

FR 156 SSFR 166 SSFR 3 SS

FR 168 SSFR 188 SSFR 4 SS

FR 1810 SS

FR 6 SS

21/2 FCHH

3 FCHH

4 FCHH

3332 FCHH5 FCHH

418 FCHH518 FCHH618 FCHH

R 2 FCHH

5532 FCHH

5632 FCHH6316 FCHHR 3 FCHH

614 FCHH814 FCHHR 4 FCHH

8516 FCHH

R 6 FCHH

Op

en T

ype

Bore diameter

（mm）

Bore diameter（mm）

Sh

ield

ed T

ype

(6) Inch Series, Flanged Type


Miniature and Extra -small Ball BearingsSupplementary Table 2 Shaft Tolerances

＋

　　＋

＋　＋

＋　＋

＋　＋

＋

＋

＋

＋

＋　　

＋

＋　

＋

＋

＋

＋　　

＋

＋

＋

＋

＋

＋

＋

　　　

＋

　

＋

　

　

2010 27 15 34 19 41 23 49 28 59 34 71 41 73 43 86 51 89 54 103 63 105 65 108 68123 77 126 80 130 84146 94 150 98 165 108171 114 189 126 195 132 220 150 225155255175265 185 300 210 310 220

ー

3

6

10

18

30

50

65

80

100

120

140

160

180

200

225

250

280

315

355

400

450

500

560

630

710

800

900

3

6

10

18

30

50

65

80

100

120

140

160

180

200

225

250

280

315

355

400

450

500

560

630

710

800

900

1 000

0 8 0 8 0 8 0 8 0 10 0 12

0　 15

0　 20

　　　 0　 25

0　 30

0　 35

0　 40

0　 45

0　 50

0 75

0　100

6 0 9 110 112 115 218 2

21 2

25 3

28 3

33 4

36 4

40 4

455

44 0

50 0

56 0

6 2 9 412 615 717 820 9

2411

2813

3315

3717

4320

4621

5023

8 212 415 618 721 825 9

3011

3513

4015

4617

5220

5721

6323

7026

8030

9034

12 2 16 4 21 6 25 7 29 8 34 9

41 11

48 13

55 15

63 17

72 20

78 21

86 23

96 26

110 30

124 34

8 413 81610201224152817

3320

3823

4527

5131

5734

6237

6740

10 4 16 8 19 10 23 12 28 15 33 17

39 20

45 23

52 27

60 31

66 34

73 37

80 40

88 44

100 50

112 56

12 6 20 12 24 15 29 18 35 22 42 26

51 32

59 37

68 43

79 50

88 56

98 62

108 68

122 78

138 88

156100

k 5 k 6 k 7 m 5 m 6 m 7 n 5 n 6 p 6 r 6 r 7

（mm）

(Refer.)

⊿dmp1）of

bearing(class 0)

2）16102315281934234128503460416243735176548863906593681067710980113841269413098144108150114166126172132194150199155225175235185266210276220

＋

＋

＋

＋

＋

＋

＋

＋

＋

＋

＋

＋

＋

＋

＋

＋

＋

＋

＋

＋

＋

＋

＋

＋

＋

＋

＋

＋

＋

＋

＋

＋

＋

＋

＋

＋

＋

＋

＋

＋

＋

＋

＋

＋

＋

＋

＋

＋

＋

＋

＋

＋

＋

＋

＋

＋

＋

＋

＋

＋

＋

＋

＋

＋

＋

＋

＋

＋

＋

＋

＋

＋

＋

＋

＋

＋

＋

＋

＋

＋

＋

＋

＋

＋

＋

＋

＋

＋

＋

＋

＋

＋

＋

＋

＋

＋

＋

＋

＋

＋

＋

＋

＋

＋

＋

＋

＋

＋

＋

＋

＋

＋

＋

　　＋

＋　＋

＋　＋

＋　＋

＋

＋

＋

＋

＋　　

＋

＋　

＋

＋

＋

＋　　

＋

＋

＋

＋

＋

＋

　

　ー　　

ー　

ー　

＋

　　＋

＋　＋

＋　＋

＋　＋

＋

＋

＋

＋

＋　　

＋

＋　

＋

＋

＋

＋　　

＋

＋

＋

＋

＋

＋

＋

　

＋

　

＋

　

　

　ー　　

ー　

ー　

＋

＋　＋

＋　＋

＋　＋

＋　＋

＋

＋

＋

＋

＋　　

＋

＋　

＋

＋

＋

＋　　

＋

＋

＋

＋

＋

＋

　

＋

＋　＋

＋　＋

＋　＋

＋　＋

＋

＋

＋

＋

＋　　

＋

＋　

＋

＋

＋

＋　　

＋

＋

＋

＋

＋

＋

＋

＋

＋

＋

＋

＋

　

＋

＋　＋

＋　＋

＋　＋

＋　＋

＋

＋

＋

＋

＋　　

＋

＋　

＋

＋

＋

＋　　

＋

＋

＋

＋

＋

＋

＋

＋

＋

＋

＋

＋

　

＋

＋　＋

＋　＋

＋　＋

＋　＋

＋

＋

＋

＋

＋　　

＋

＋　

＋

＋

＋

＋　　

＋

＋

＋

＋

＋

＋

　

　ー　　

ー　

ー　

＋

＋　＋

＋　＋

＋　＋

＋　＋

＋

＋

＋

＋

＋　　

＋

＋　

＋

＋

＋

＋　　

＋

＋

＋

＋

＋

＋

＋

＋

＋

＋

＋

＋

　

＋

＋　＋

＋　＋

＋　＋

＋　＋

＋

＋

＋

＋

＋　　

＋

＋　

＋

＋

＋

＋　　

＋

＋

＋

＋

＋

＋

＋

＋

＋

＋

＋

＋

　

　

－

　

－

　

－

　

－

　

－

　

－

　

－

　

－　

－

　

　

　

　

－

　

－

　

－

　

－

　

－

　

－

　

　

　

－

4 0 6 1 7 1 9 111 213 2

15 2

18 3

21 3

24 4

27 4

29 4

32 5

10　 0131161191232272

32 2

38 3

43 3

50 4

56 4

61 4

68 5

70 0

80 0

90 0

　

ー

　

ー

　

ー

　

ー

　

ー

　

ー

　

ー

　

ー

　

ー

　

ー

　

ー

　

ー

　

ー

ー

3

6

10

18

30

50

80

120

180

250

315

400

500

630

800

3

6

10

18

30

50

80

120

180

250

315

400

500

630

800

1 000

14 20 20 28 25 34 32 43 40 53 50 66

60 79

72 94

85110

100129

110142

125161

135175

145 189

160210

170226

6 12 10 18 13 22 16 27 20 33 25 41

30 49

36 58

43 68

50 79

56 88

62 98

68 108

76 120

80 130

86 142

2 6 4 9 5 11 6 14 7 16 9 20

10 23

12 27

14 32

15 35

17 40

18 43

20 47

2　 8 4 12 5 14 6 17 7 20 9 25

10 29

12 34

14 39

15 44

17 49

18 54

20 60

22 66

24 74

26 82

0 4 0 5 0 6 0 8 0 9011

013

015

018

020

023

025

027

0 6 0 8 0 9011013016

019

022

025

029

032

036

040

044

050

056

010012015018021025

030

035

040

046

052

057

063

070

080

090

0 25 0 30 0 36 0 43 0 52 0 62

0 74

　 0 87

0100

0115

0130

0140

0155

0175

0200

0230

0 40 0 48 0 58 0 70 0 840100

0120

0140

0160

0185

0210

0230

0250

0280

0320

0360

2

2.5

3

4

4.5

5.5

6.5

7.5

9

10

11.5

12.5

13.5

3

4

4.5

5.5

6.5

8

9.5

11

12.5

14.5

16

18

20

22

25

28

5

6

7

9

10

12

15

17

20

23

26

28

31

35

40

45

2　 3 2 4 2 5 3 5 4 6 5

6 7

6 9

711

713

716

718

720

4 2 6 2 7 2 8 3 9 411 5

12 7

13 9

1411

1613

16

18

20

d 6 e 6 f 6 g 5 g 6 h 5 h 6 h 7 h 8 h 9 h 10 j s 5 j s 6 j s 7 j 5 j 6

Nominal shaft dia.（mm）

Deviation classes of shaft diameter

202630384049506165788096

100119

120142

145170

170199

190222

210246

230270

260304

290340

320376

ー

ー

ー

ー

ー

ー

ー

ー

ー

ー

ー

ー

ー

ー

ー

ー

ー

ー

ー

ー

ー

ー

ー

ー

ー

ー

ー

ー

ー

ー

ー

ー

ー

ー

ー

ー

ー

ー

ー

ー

ー

ー

ー

ー

ー

ー

ー

ー

ー

ー

ー

ー

ー

ー

ー

ー

ー

ー

ー

ー

ー

ー

ー

ー

ー

ー

ー

ー

ー

ー

ー

ー

ー

ー

ー

ー

ー

ー

ー

ー

ー

ー

ー

ー

ー

ー

ー

ー

ー

ー

ー

ー

ー

ー

ー

ー

ー

ー

ー

ー

ー

ー

ー

ー

ー

ー

ー

ー

ー

ー

ー

ー

ー

ー

ー

ー

ー

ー

ー

ー

ー

ー

　ー　　

ー　

ー　

ー

ー

ー

ー

ー

ー

ー

ー

ー

ー

ー

ー

ー

ー

ー

ー

ー

ー

ー

ー

ー

ー

ー

ー

ー

ー

ー

ー

ー

ー

ー

ー

　ー　　

ー　

ー　

　

ー

　

ー

　

ー

　

ー

　

ー

　

ー

　

ー

　

ー

　

ー

　

ー

　

ー

　

ー

　

ー

ー

　

ー

　

ー

　

ー

　

ー

　

ー

　

ー

　

ー

　

ー

　

ー

　

ー

　

ー

　

ー

　

ー

　

ー

　

ー

ー

　

ー

　

ー

　

ー

　

ー

　

ー

　

ー

　

ー

　

ー

　

ー

　

ー

　

ー

　

ー

　

ー

　

ー

　

ー

ー

　

ー

　

ー

0 14 0 18 0 22 0 27 0 33 0 39

0 46

0 54

0 63

0 72

0 81

0 89

0 97

0110

0125

0140

　

ー

　

ー

　

ー

　

ー

　

ー

　

ー

　

ー

　

ー

　

ー

　

ー

　

ー

　

ー

　

ー

ー

　

ー

　

ー

　

ー

　

ー

　

ー

　

ー

　

ー

　

ー

　

ー

　

ー

　

ー

　

ー

　

ー

　

ー

　

ー

ー

　

ー

　

ー

　

±

　

±

　

±

　

±

　

±

　

±

　

±

　

±

　

±

　

±

　

±

　

±

　

±

　ー　　

ー　

ー　

　

±

　

±

　

±

　

±

　

±

　

±

　

±

　

±

　

±

　

±

　

±

　

±

　

±

　

±

　

±

　

±

　

±

　

±

　

±

　

±

　

±

　

±

　

±

　

±

　

±

　

±

　

±

　

±

　

±

　

±

　

±

　

±

　

±

　＋

ー　＋

ー　＋

ー　＋

ー　＋

ー

　＋

ー

　＋

ー

＋

ー

　＋

ー

　＋

ー

　＋

ー

　＋

ー

　

　ー　　

ー　

ー　

＋

ー　＋

ー　＋

ー　＋

ー　＋

ー

＋

ー

＋

ー　　

＋

ー　

＋

ー

＋

ー　　

±

　

±

　

±

　

　ー　　

ー　

ー　

over up to over up to

Unit μm

Supplementary Table 2 Shaft Tolerances (deviation from nominal dimensions)

Nominal shaft dia.

⊿dmp ; single plane mean bore diameter deviation These shall be applied to bearings with a nominal bore diameter 0.6 mm and more

Notes 1)2)

64 65

Miniature and Extra -small Ball BearingsSupplementary Table 3 Housing Bore Tolerances

ー

ー　ー

ー　ー

ー　ー

ー　ー

ー　ー

ー

ー

ー　　

ー

ー

　

ー

ー

ー

ー

　　

ー

ー

ー

ー

　ー

ー

10 20 11 23 13 28 16 34 20 41 25 50 30 60 32 62 38 73 41 76 48 88 50 90 53 93 60106 63109 67113 74126 78130 87144 93150103166109172150220155225175255185265210300220310250355260365

ー

3

6

10

18

30

50

65

80

100

120

140

160

180

200

225

250

280

315

355

400

450

500

560

630

710

800

900

1 000

1 120

K 5 K 6 K 7 M 5 M 6 M 7 N 5 N 6 N 7 P 6 P 7

（mm）

3

6

10

18

30

50

65

80

100

120

140

160

180

200

225

250

280

315

355

400

450

500

560

630

710

800

900

1 000

1 120

1 250

R 7

0 4 0 5 1 5 2 6　 1 8 2 9

310

213

315

218

320

322

225

　

0 6 2 6 2 7 2 9　 211 313

415

418

421

524

527

729

832

044

050

056

066

2 6 3 8 410 412　 514 516

619

823

927

1131

1336

1439

1643

2 8 0 12 0 15 0 18　 0 21 0 25

0 30

0 35

0 40

0 46

0 52

0 57

0 63

26 96

30110

34124

40145

2 8 1 9 3 12 4 15　 4 17 4 20

5 24

6 28

8 33

8 37

9 41

10 46

10 50

26 70

30 80

34 90

40106

4 8 712 814 917　12211324

1528

1833

2139

2545

2750

3055

3360 　

4 10 5 13 7 16 9 20　 11 24 12 28

14 33

16 38

20 45

22 51

25 57

26 62

27 67

44 88

50100

56112

66132

4 14 4 16 4 19 5 23　 7 28 8 33

9 39

10 45

12 52

14 60

14 66

16 73

17 80

44114

50130

56146

66171

6 12 9 17 12 21 15 26　 18 31 21 37

26 45

30 52

36 61

41 70

47 79

51 87

55 95

78122

88138

100156

120186

6 16 8 20 9 24 11 29　 14 35 17 42

21 51

24 59

28 68

33 79

36 88

41 98

45108

78148

88168

100190

120225

　

ー　　

ー　＋

ー　＋

ー　＋

ー

＋

ー

＋

ー　　

＋

ー　

＋

ー

＋

ー　　

＋

ー

＋

ー

　＋

ー

　ー　　

ー　

ー　

ー　

　

ー　＋

ー　＋

ー　＋

ー　＋

ー

＋

ー

＋

ー　　

＋

ー　

＋

ー

＋

ー　　

＋

ー

＋

ー

　＋

ー

ー

ー

　

ー

ー

　

ー　＋

ー　＋

ー　＋

ー　＋

ー

＋

ー

＋

ー　　

＋

ー　

＋

ー

＋

ー　　

＋

ー

＋

ー

　＋

ー

ー

ー

　

ー

ー

　ー　　

ー　

ー　

ー　

ー

ー　ー

ー　ー

ー　ー

ー　ー

ー　ー

ー

ー

ー　　

ー

ー

　

ー

ー

ー

ー

　　

ー

ー

ー

ー

　ー

ー

ー

ー

ー

ー

ー

ー

ー

ー

　ー　　

ー　

ー　

ー　

ー

ー　ー

ー　ー

ー　ー

ー　ー

ー　ー

ー

ー

ー　　

ー

ー

　

ー

ー

ー

ー

　　

ー

ー

ー

ー

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ー

ー

ー　ー

ー　ー

ー　ー

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ー　ー

ー

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ー　　

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ー

　

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ー　ー

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ー

ー

ー　　

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ー

　

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ー

ー

　　

ー

ー

ー

ー

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800

1 000

3

6

10

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30

50

80

120

180

250

315

400

500

630

800

1 000

1 250

（mm）

20 14 28 20 34 25 43 32 53 40 66 50

79 60

94 72

110 85

129100

142110

161125

175135

189145

210160

226170

261195

4 6

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8 710 8　12 91411

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E 6 F 6 F 7 G 6 G 7 H 6 H 7 H 8 H 9 H 10 J 6 J 7 JS 5 JS 6 JS 7

12 6 18 10 22 13 27 16 33 20 41 25

49 30

58 36

68 43

79 50

88 56

98 62

108 68

120 76

130 80

142 86

164 98

16 6 22 10 28 13 34 16 41 20 50 25

60 30

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146 76

160 80

176 86

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8 212 414 517 620 725 9

2910

3412

3914

4415

4917

5418

6020

6622

7424

8226

9428

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190

220

250

290

320

360

400

440

500

560

660

10 0 12 0 15 0 18 0　 21 0 25 0

30 0

35 0

40 0

46 0

52 0

57 0

63 0

70 0

80 0

90 0

105 0

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46 0

54 0

63 0

72 0

81 0

89 0

97 0

110 0

125 0

140 0

165 0

25 0 30 0 36 0　　 43 0　 52 0 62 0

74 0

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1000

1150

1300

1400

1550

1750

2000

2300

2600

40 0 48 0 58 0 70 0　 84 01000

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1400

1600

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2100

2300

2500

2800

3200

3600

4200

2 4 5 3 5 4 6 5　 8 510 6

13 6

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25 7

29 7

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5.5

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9.5

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18

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40 10

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54 14

61 15

69 17

75 18

83 20

92　　 22

　　　　104 24

116 26

133 28

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2

2.5

3

4

4.5

5.5

6.5

7.5

9

10

11.5

12.5

13.5

over up to over up to

Unit μm

Supplementary Table 3 Housing Bore Tolerances (deviation from nominal dimensions)

(Refer.)

⊿Dmp1）of

bearing(class 0)

Nominal bore dia. Deviation classes of housing bore Nominal bore dia.

（up to150）

（over150）

0 8 0 8 0 8 0 8 0 9 0 11

0　 13

0　 15

　　

0　 30

0　 35

0　 40

0　 45

0　 50

0 75

0　100

0　125

Notes 1) ⊿Dmp ; single plane mean outside diameter deviation 2) These shall be applied to bearings with a nominal outside diameter 2.5 mm and more66 67

68

Supplementary Table 4 Numerical Values for Standard Tolerance Grades IT

Supplementary Table 5 Prefixes used with SI Units

Supplementary Table 4 Numerical Values for Standard Tolerance Grades IT

69


Supplementary Table 6 (1 ) SI Units and Conversion Factors

70

Supplementary Table 6 (2) SI Units and Conversion Factors

Supplementary Table 6 SI Units and Conversion Factors

71



72


Supplementary Table 6 SI Units and Conversion Factors

73


Supplementary Table 7 Inch / Millimeter Conversion

74

Supplementary Table 8 Steel Hardness Conversion

Supplementary Table 8 Steel Hardness Conversion

75


Supplementary Table 9 Viscosity Conversion

76

Research and Development

KOYO SEIKO promotes research and developmentactivities through an excellent research environment fea-turing advanced research facilities. We are steadily making improvements in the perfor-mance of miniature and extra-small ball bearings, suchas low torque, high running accuracy, and longer life. We are also actively developing new products.

● Technical Center (Osaka,Japan)

Research and Development

● Vibration tester ● Surface roughness / form tester

● Clean room ● Thermo-hydrostatic test chamber

77


With more than 75 years experience, KOYO SEIKOproduces bearings using state-of-the-art manufactur-ing facilities.

Plants

● MS Project Division (Kagawa,Japan)

● KOYO NIDEC (DALIAN) PRECISION BEARINGS CO., LTD. (Dalian, China)

* I S O 9002 certified.

● WUXI KOYO BEARING CO., LTD. (Wuxi, China)

KOYO SEIKO CO., LTD. HEAD OFFICE No.5-8, Minamisemba 3-chome,Chuo-ku,Osaka 542-8502,JAPAN

TEL : 81-6-6245-6087

FAX : 81-6-6244-0814

TLX : 63040(KOYO OSJ)

KOYO CANADA INC. 5324 South Service Road,Burlington,Ontario L7L 5H5,CANADA

TEL : 1-905-681-1121

FAX : 1-905-681-1392

KOYO CORPORATION OF U.S.A. 29570 Clemens Road,P.O.Box 45028,Westlake,OH 44145,U.S.A.

TEL : 1-440-835-1000

FAX : 1-440-835-9347

TLX : 0985461(AMKOY RKVR)

KOYO CORPORATION OF U.S.A.(AUTO SALES & TECHNICAL CENTER) 47771 Halyard Drive,Plymouth,MI 48170,U.S.A.

TEL : 1-734-454-1500

FAX : 1-734-454-4076

KOYO STEERING SYSTEMS OF U.S.A. INC. 47771 Halyard Drive,Plymouth,MI 48170,U.S.A

TEL : 1-734-454-7067

FAX : 1-734-454-7059

KOYO DE MÉXICO, S.A. Av.Primero de Mayo No.153,53500 Naucalpan Edo.de México,MÉXICO

TEL : 52-5-358-0214,0077

FAX : 52-5-576-8827,8871

KOYO LATIN AMERICA, S.A. Edificio Banco del Pacifico Planta Baja,Calle Aquilino de La Guardia y

Calle 52,Panama,REPUBLICA DE PANAMA

P.O.Box 6-1797,El Dorado,Panama,REPUBLICA DE PANAMA

TEL : 507-264-0921,0977

FAX : 507-264-2782,507-269-7578

KOYO ROLAMENTOS DO BRASIL LTDA. Rua Desembargador Eliseu Ghilherme 304,7-Andar,Paraiso CEP 04004-30,BRASIL

TEL : 55-11-887-9173

FAX : 55-11-887-3039

THAI KOYO CO., LTD. 193/53 Lake Rajada Office Complex 14th Floor Unit B,Rachadapisek Road,

Klongtoey,Bangkok 10110 THAILAND

TEL : 66-2-264-0395,66-2-661-9603~5

FAX : 66-2-661-9606

KOYO SINGAPORE BEARING (PTE.) LTD. 38 Tuas West Road,Singapore 638385,SINGAPORE

TEL : 65-274-2200

FAX : 65-862-1623

PHILIPPINE KOYO BEARING CORPORATION Rm.504,Comfoods Bidg., Cor. Gil Puyat Ave.and Pasong Tamo,Makati

City,PHILIPPINES

TEL : 63-2-817-8881,8901

FAX : 63-2-867-3148

KOYO SEIKO CO., LTD. SEOUL BRANCH Inwoo Building 6F,539-11,Shinsa-Dong,Kangnam-Ku,Seoul,KOREA

TEL : 82-2-549-7922

FAX : 82-2-549-7923

KOYO SEIKO CO., LTD. BEIJING LIAISON OFFICE Peace Hotel Room 2804,No.3 JinYu HuTong,Beijing,CHINA

TEL : 86-10-6512-5673,9401

FAX : 86-10-6512-5674

KOYO AUSTRALIA PTY. LTD. Unit 7,175-179 James Ruse Drive,Rosehill,2142 N.S.W.,AUSTRALIA

P.O.Box 442, Rydalmere, 2116 N.S.W., AUSTRALIA

TEL : 61-2-9638-2355

FAX : 61-2-9638-3368

KOYO SEIKO CO., LTD. EUROPEAN CENTRAL OFFICE Markerkant 13-01,1314 AL,Almere,THE NETHERLANDS

TEL : 31-36-5383333

FAX : 31-36-5347212

KOYO KULLAGER SCANDINAVIA A.B. Kanalvägen 1B,194 61 Upplands-Väsby,SWEDEN

TEL : 46-8-590-341-85

FAX : 46-3-590-309-69

KOYO (U.K.) LTD. Whitehall Avenue,Kingston,Milton Keynes MK10 OAX,UNITED KINGDOM

TEL : 44-1908-289300

FAX : 44-1908-289333

EUROPA-KOYO B.V. Lekdijk 187-2967 GJ Langerak,Nieuwpoort,THE NETHERLANDS

P.O.Box 1-2965 ZG,Nieuwpoort,THE NETHERLANDS

TEL : 31-184-606800

FAX : 31-184-602572,606857

KOYO ROMANIA REPRESENTATIVE OFFICE Str. Frederic Jolliot-Curie,Nr.3,Etaj 1,Ap.2, Sector 5 Bucharest,RUMANIA

TEL : 40-1-410-4170,4182,0984

FAX : 40-1-410-1178

KOYO DEUTSCHLAND GMBH. Bargkoppelweg 4,D-22145 Hamburg,GERMANY

P.O.Box 73 06 60,D-22126 Hamburg,GERMANY

TEL : 49-40-67-9090-0

FAX : 49-40-67-9203-0

TLX : 213138(KOYO D)

KOYO FRANCE S.A. 8 Rue Guy Moquet,B.P.189 Z.I.,95105 Argenteuil Cedex,FRANCE

TEL : 33-1-3998-4222

FAX : 33-1-3998-4244,4249

KOYO IBERICA, S.A Calle Aramayona S/N,Naves 1 y 2,Poligono Industrial "Las Mercedes",

28022 Madrid,SPAIN

TEL : 34-91-329-0818

FAX : 34-91-747-1194

KOYO ITALIA S.R.L. Via Bronzino 9,20133 Milano,ITALY

TEL : 39-02-2951-0844

FAX : 39-02-2951-0954

INTERNATIONAL NETWORK

*

*

（）KOYO SEIKO CO., LTD. (Japan) is certified to ISO9001. ISO9002 certified. *

CAT.NO.295EPrinted in Japan ,97.9-3CM(,97.9)


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