Bearing Cross Reference.pdf

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Types of bearings

Created: 2005 Apr 06

Updated: 2005 Apr 06

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One way to categorize bearings is by the type of rolling element they use. Using this method, there are fivetypes of bearings:

Ball bearings

Photo courtesy of NSK.

Cylindrical roller bearings


Needle roller bearings


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Tapered roller bearings


Spherical roller bearings



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Ball bearing cross-references




Glossary

Radial ball bearings will accommodate moderate to heavy radial loads and low to moderate thrustloads in either direction.Deep groove radial bearings are manufactured as open type bearings for oil or grease lubrication.They are also available with metal shields and/or seals for use where moderate contamination is presentin the operation.Angular contact bearings are single row types used where radial and thrust loads are combined inthe same application. They provide sufficient internal clearances to assume a specific contact angleunder thrust loading and are available with angles of 15, 30 and 40 degrees.Double row bearings are manufactured both as filling slot and Conrad types, in light and mediumseries. The filling slot type has higher load capacity but the Conrad type provides a quieter operationand should be used when noise is a consideration.Self-Aligning bearings are manufactured with two rows of balls and one continuous sphericalraceway in the outer ring. This allows for limited misalignment of the shaft and housing.Maximum capacity bearings are filling slot type bearings used in applications involving heavy radialloads and low speeds where thrust loads are comparatively low. The incorporated filling slots in the

inner and outer rings so they can be loaded with additional balls for greater capacity.Mast guide bearings are bearings with a high load capacity, specially designed for use in fork lifttrucks. These bearings are similar to single row or double row deep groove bearings but the outer racehas a very thick cross-section which performs as a wheel or tire. Mast guide bearings can withstand heavy radial loads and occasional thrust loads. Mounted on the fork carriage they provide smoothaction as the forks are raised and lowered.Integral shaft bearings include a shaft with bearing races machined on its OD The outer bearing ring,cage and rolling elements are mounted directly on the shaft and an inner ring is not required. These arecommonly referred to as water pump bearings since that is a major application for them.

Special bearings include Inch Series bearings, bearings made specifically for automotive air compressor applications and bearings made with special bore, width, or OD

Interchange - Single Row Deep Groove Ball Bearings


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Photo courtesy of McMaster-Carr.


Description NSK SKF Torr / Faf FAG MRC

P/N

Inch Rxx Rxx Sxx Rxx Rxx

Extra small 6xx 6xx 3x 6xx 3x

Extra light 60xx 60xx 91xxK 60xx 1xxK

Light 62xx 62xx 2xx 62xx 2xxSMedium 63xx 63xx 3xx 63xx 3xxS

Extra thin section 68xx 618xx -- 618xx --

Very thin section 69xx 619xx 93xxK 619xx --

Thin section 16xxx 16xxx -- 16xxx --

Maximum capacity, light BL2xx 2xx 2xxW 2xx 2xxMMaximum capacity, medium BL3xx 3xx 3xxW 3xx 3xxM

Two seals (contact) DDU 2RS PP 2RSR ZZ

One seal (contact) DU RS P RSR Z

Two shields ZZ 2Z DD 2ZR FF

One shield Z Z D ZR FSnap ring NR NR G NR G

Steel cage BLANK J BLANK BLANK BLANK


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Heat stabilized 200C X28 S1 -- S1 --

Tight clearance C2 C2 H C2 Tight Normal clearance BLANK BLANK R BLANK Normal

Loose clearance C3 EM(C3) P C3 Loose

Extra loose clearance C4 C4 J C4 Extra Loose

Electric motor grade E QE6 -- -- --

Interchange - Double Row Ball Bearings



Description NSK SKF Torr / Faf MRC

P/N

Self-aligning, extra narrow 12xx 12xx -- --

Self-aligning, narrow 133xx 13xx -- --Self-aligning, wide 22xx 22xx -- --

Self-aligning, extra wide 23xx 23xx -- --Double row, maximum compliment, light 32xx 52xxE 52xxW 52xxM (K)

Double row, max. compliment, medium 33xx 53xxE 53xxW 53xxM (K)

Double row conrad li ht 52xx 52xxA 52xxK 52xxC SBK


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Double row, conrad, medium 53xx 53xxA 53xxK 53xxC (SB)

Suffix

Two seals 2RS 2RS1 -- --

Two shields ZZ 2Z -- FF

Snap ring NR NR G G polyamide cage TNG TN9 pRB --

Steel cage J BLANK BLANK BLANK Tapered bore K K -- --

Extra capacity E E -- --

Tight clearance C2 C2 H C2

Normal clearance BLANK BLANK R BLANK Loose clearance C3 C3 p C3

Extra loose clearance C4 C4 J C4

Interchange - Angular Contact (ABEC 1 & 3) Ball Bearings



Description NSK SKF FAG MRC


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Torr / Faf

P/N

Light 72xx 72xx 72xx 72xx 72xx

Medium 73xx 73xx 73xx 73xx 73xx

Heavy 74xx 74xx 74xx 74xx 74xx

Suffix

40 deg. contact B B WN B pJ

30 deg. contact A -- -- -- BLANK 25 deg. contact A5 ACD -- E --

15 deg. contact C CD -- C R Machined brass cage M M MBR Mp BRZ

pressed brass cage Y Y BLANK Yp --

polyamide cage TY p pRC TVp BKE

Steel cage W J -- Jp BLANK

Flush ground faces G G BLANK UO,UA DU petrochemical BMpC BECBM -- -- pumppac*


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Roller bearing cross-references




Glossary - Cylindrical Roller Bearings

NU style single row - NU style bearings have two machined flanges on the outer ring and no flangeson the inner ring.N Style single row - N style bearings have two machined flanges on the inner ring and no flanges onthe outer ring, with rollers and cage on the inner ring. Like the NU style, the N has no thrust load carrying capability.NJ style single row - NJ style bearings have two machined flanges on the outer ring and a machined flange on one side of the inner ring. The roller and cage assembly is in the outer ring. The integral flangeon the inner ring allows this bearing to carry an axial load.NF style single row - NF style bearings have two machined flanges on the inner ring and one flangeon the outer ring, with roller and cage on the inner ring. Like the NJ bearing, these bearings have somethrust load capability.NH style single row - NH style bearings have two machined flanges on the outer ring and amachined flange on one side of the inner ring. A special-design inner ring allows use of a stabilizing ringon the non-flange side. As a result, these bearings can carry axial loads in both directions. The roller and cage assembly is mounted in the outer ring.

NUP style single row - NUP style bearings are similar to the NJ style and come with a special ringoften called a thrust collar. Mounted on the non-flange side of the inner ring, the thrust collar allows the

bearing to carry an axial load in both directions. The thrust collar extends out of the bearing on oneside, so the dimension across the inner ring is slightly greater than that of the outer ring.Double row styles (NN, NNU) - Double Row cylindrical roller bearings are denoted by two N'swithin the part number (e.g., NN or NNU). The dimensions for these can be found in the Super Precision section of this catalog and can be ordered with standard precision.S-Type - Sealed-Clean Bearings for chain conveyors demonstrate a high efficiency under hightemperatures and wet conditions for a longer period with an improved sealing system. These bearings

are packed with a quality grease of high thermal resistance and durability.Continuous Caster Roller Bearings - These are 2-split bearing units of a highly reliable design and feature a long service life. Cylindrical roller bearings with self-aligning rings having a proper alignmentfunction.Four Row Cylindrical Roller Bearings - Are also popular roll neck bearings providing several


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benefits. First, the inner ring is separable form the outer ring and rollers which allows the inner ring toremain with the roll during grinding processes. This assures precise concentricity and negligible run-out

providing for high rolling accuracy. Secondly, this design allows for greater radial load carrying and higher operating speeds. Four row cylindricals must be used in combination with a thrust bearing whichis usually a two row taper, angular contact ball bearings, or a deep groove ball bearing depending onthe thrust load present.

Interchange - Cylindrical Roller Bearings



Description NSK SKF FAG

Prefix

Single row, no flanges on outer ring N N N

Single row, no flanges on inner ring NU NU NU

Single row, 1 flange inner NJ NJ NJ

Single row, 1 flange outer NF NF --Single row, 1 flange inner, with retaining ring NUP NUP NUP

Single row, 1 flange inner w/stabilizing ring NH NH NH

Double row, flanges outer/flanges inner HJ HJ HJ NNU/NN NNU/NN NNU/NN

Light 2XX 2XX 2XXMedium 3XX 3XX 3XX


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P/NHeavy 4XX 4XX 4XX

Extra Light 10XX 10XX 10XX

Light, Wide 22XX 22XX 22XX

Medium, Wide 23XX 23XX 23XX

Suffix

Ployamide cage T P TVP2

Composite high temp (200C) cage T7 -- --Machined brass cage M M M,M1

Pressed steel cage W,WS J JP1

High capacity design E EC E

Full complement (no cage) V V V

Tight clearance C2 C2 C2

Normal clearance BLANK BLANK BLANK

Loose clearance C3 C3 C3Extra loose clearance C4 C4 C4

Glossary - Spherical Roller Bearings

Spherical Roller Bearings - Are double row self-aligning bearings capable of carrying heavy radialloads combined with moderate thrust loads in either direction. They are extremely resistant to shock loads and their self-aligning feature allows full capacity loading despite shaft deflection.Continuous Caster Rollers - These are 2-split bearing units of a highly reliable design and feature along service life. Cylindrical roller bearings with self-aligning rings having a proper alignment function.Spherical Roller Bearings TL Series - Excellent performance with high temperature equipment.High strength to prevent inner ring fractures.Shaker Screen Bearings - Are designed for vibrating applications such as screens, feeders and compactors. These are self-aligning spherical roller bearings designed to accommodate the high loads,static and dynamic misalignment characteristics, and severe environmental conditions inherent in theseapplications.Triple Ring Bearings - Are specially designed for use with controlled crown rolls used extensively inthe paper industry. These high load capacity bearings provide "shaft within shaft" operation, whilesimplifying the surrounding structure and installation.

Interchange - Spherical Roller Bearings

Photo courtesy of


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NSK.


Description NSK SKF Torr/FAF FAG

P/N

Very Light 239xx 239xx 239xx 239xx

Light 230xx 230xx 230xx 230xxLight, Wide 240xx 240xx 240xx 240xx

Medium 231xx 231xx 231xx 231xx

Medium, Wide 241xx 241xx 241xx 241xx

Heavy 222xx 222xx 222xx 222xx

Heavy, Wide 232xx 232xx 232xx 232xxExtra Heavy 213xx 213xx 213xx 213xx

Extra Heavy, Wide 223xx 223xx 223xx 223xx

Suffix

Bronze case, one piece, guide ring CAM,AM CA,CACM YM MBronze cage, two piece, guide flange M MC BR MB

Steel cage, two piece, guide ring C,CD CJ,CC CJ, VJ BLANK

Polyamide cage, two piece H -- VCF TVPB

Tapered bore 1:12 K K K K Tapered bore 1:30 K30 K30 K K30

Carburized steel, complete bearing g ECD W40 W209

Carburized steel, inner ring only g3 ECB W401 W209B

Lube groove & holes outer ring E4 W33 W33 S

Lube groove & holes outer ring, holes inner ring E7 W513 W33W94 Sheading0AB

Holes only outer ring E3 W20 W20 SY

Holes only inner ring E5 W26 W94 heading0AB No relube features BLANK BLANK BLANK --

Plugs provided for outer ring holes E42 W77 W84 heading0


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Combination W33, W4, W31 E4P53 W507 W33W4W31 --Combination W33, W31 E4U22 W506 W33W31 --

Combination W33, W26, W31 E7U22 W509 W33W94W31 Sheading0AOuter ring w/extra close running accuracy P52 C04 C04 T52BN

Inner ring w/extra close running accuracy P53 C02 C02 T52BE

Inner & outer ring w/extra close runningaccuracy P55 C08 C08 T52BW

Special inspection measures U22 W31 W31 --

Inner ring & outer ring heat stabilized to200C S11 S1 -- --

Tight clearance C2 C2 C2 C2

Normal clearance BLANK BLANK BLANK BLANK Loose clearance C3 C3 C3 C3

Extra loose clearance C4 C4 C4 C4

Glossary - Tapered Roller Bearings

Four Row Tapered Roller Bearings Are very popular for use on roll necks. Most of these bearingsare composed of two double cones (four Inner ring raceways), a cone spacer, two single cups (one ateach end), one double cup (the center two raceways in the outer rings), and two cup spacers. Theyare very effective at operating under heavy radial and axial loads at low to moderate speeds. NSK four row tapered bearings are standardly supplied with carburized rings and rollers and are compatiblewith industry standards. "Sealed-Clean" bearings are four row tapers with seals for the harshest of operating environments. NSK's patented design provides the optimum sealing efficiency with only aslight loss of capacity.Two Row Tapered Roller Bearings Are very common as the back-up thrust bearing in a rolling millor as the roll neck in lighter duty rolling mills. Two row tapers are designed in a variety of styles for different applications. Converging bearings (TDI, TDIE, TDIS) consist of one double cone and twosingle cups possibly with a cup spacer. Diverging bearings (TDO, TDOD, TDOC) consist of twosingle cones, a cone spacer, and one double cup.

Interchange - Inch Tapered Roller Bearings


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Description NSK SKF Timken FAG

Extra heavy EH EH EH KEH


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Prefix

Heavier than heavy HH HH HH KHH

Heavy H H H KH

Heavy medium HM HM HM KHMMedium M M M KM

Light medium LM LM LM KLM

Light L L L KLLighter than light LL LL LL KLLExtra light EL EL EL KEL

CupAngle

0 to 2359'59.99 1xxxx 1xxxx 1xxxx 1xxxx


2530' to 2659'59.99 3xxxx 3xxxx 3xxxx 3xxxx27 to 2829'59.99 4xxxx 4xxxx 4xxxx 4xxxx

2830' to 3029'59.99 5xxxx 5xxxx 5xxxx 5xxxx3030' to 3229'59.99 6xxxx 6xxxx 6xxxx 6xxxx

3230' to 3559'59.99 7xxxx 7xxxx 7xxxx 7xxxx


45 up, but not thrust only conforms to AFBMA standard casecarburized cup & cone 9xxxx 9xxxx 9xxxx 9xxxx

RG

Interchange - Metric Tapered Roller Bearings

Description NSK SKF Timken FAG

P/N

High capacity design HR -- -- --

Light HR302xx 302xx 302xx 302xxMedium HR303xx 303xx 303xx 303xx

Medium, steep angle HR303xxD 313xx 313xx 313xxExtra light, wide HR329xx 329xx 329xx 329xx

very light, wide HR320xx 320xx 320xx 320xxLight, wide HR322xx 322xx 322xx 322xx

Medium, wide HR323xx 323xx 323xx 323xx

Very light, extra wide HR330xx 330xx 330xx 330xx

Light, extra wide HR331xx 331xx 331xx 331xx

Medium, extra wide HR332xx 332xx 332xx 332xx

Suffix

Medium contact angle C B B B

Steep contact angle D -- -- --

Modified internal design X X X X


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Conforms to ISO 355 J -- -- A


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Thrust bearing cross-references




Glossary

Cylindrical roller thrust bearings (TMP) - These are thrust bearings containing cylindrical rollers.They can sustain only axial loads, but they are suitable for heavy loads and have high axial rigidity. Thecages are machined brass.Tapered roller thrust bearings (TT, TTF or V-Flat) - These are thrust bearings containing tapered rollers. TT-type bearings, which have a rib on the housing washer, can accurately guide the shaft in theradial direction. TTF-type bearings, which have no rib on the housing washer, can tolerate someeccentricity during operation.The ball thrust bearings are designed to handle thrust loads while operating at high speeds. These

bearings can be ordered with an aligning seat and aligning washer if misalignment or deflection can not be avoided.The spherical thrust bearings are designed to handle very heavy thrust loads in one direction whileoperating at low to moderate speeds. The design of the spherical thrust will also allow for some radialload while thrust load is imposed. The spherical shape of the outer ring raceway makes these bearingsexcellent for handling misalignment.

Interchange - Ball Thrust Bearings



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Description NSK SKF FAG

P/N

Single direction 511xx 511xx 511xx

Single direction 512xx 512xx 512xx

Single direction 513xx 513xx 513xxSingle direction 514xx 514xx 514xx

Single direction with aligning seat 532xx 532xx 532xx

Single direction with aligning seat 533xx 533xx 533xx

Single direction with aligning seat 534xx 534xx 534xxDouble direction 522xx 522xx 522xx

Double direction 523xx 523xx 523xx

Double direction 524xx 524xx 524xx

Double direction with aligning seat 542xx 542xx 542xx



Suffix

Steel cage BLANK J FP

Brass cage M M MP

Boundary dimensions adopted to ISO X -- X

With self-aligning seat washer U U UABEC 5 precision class P5 P5 P5

Interchange - Spherical Thrust Bearings


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Description NSK SKF FAG Torrington

P/N

Light 292xx 292xx 292xx 292xx

Medium 293xx 293xx 293xx 293xx

Heavy 294xx 294xx 294xx 294xx

SuffixSteel Cage H EJ E EJBrass Cage M M EMB EM




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Mounted bearing unit cross-references




Glossary

Standard Duty Pillow Blocks bearings are mounted in rigid housings of simple construction. Theseare the most common pillow blocks and are used extensively for various kinds of power transmissionin stationary equipment and machinery.Standard Duty, Low Base Pillow Blocks are basically the same design as standard pillow blocks,however the lower base provides a lower center of operation. This makes the unit particularly suitablewhen space between the center and the mounting base is limited.Cylindrical Cartridge Bearings are designed to provide shaft support where the shaft axis is

perpendicular to and passing through a solid support, in a location where the cartridges can bemounted with a press rather than bolt flanges.Standard Duty, 4-bolt Flange units have square flanges which can be easily attached to a mountingsurface with four bolts. This simple method of installation makes this unit convenient for applicationswhere frequent disassembly may be required.Standard Duty, 4-bolt Flange have the same design as the set-screw type, however the distance

between bearing center and flange back face is longer, to provide sufficient clearance to use a bearingwith an eccentric locking collar.

Standard Duty 2-bolt Flange units have a housing with an oval flange with two bolt holes for mounting. This type of unit is easily installed and is suitable where mounting space is limited or where itis necessary to minimize the distance between shafts.

Interchange - Mounted Bearing Units


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Description NSK SKF Torr/FAFSeal

Master

Insert

Bearing, tapered bore w/adaptor, relube UK -- -- --Bearing, set screw, wide ir, relube UC YAR2 GCxxxxKRRB 2-xx

Bearing, set screw, narrow ir, non-relube UB -- -- V

Bearing, ecc locking collar, narrow ir, non-relube EN YET2 GRAxxxxRRB VxxE

Bearing, ecc locking collar, wide ir, relube EW YEL2 GxxxxKRRB R-xxE

Prefix

Block, tapped-base with set screw UCPA -- -- TB

Block, with set screw UCP SYxxTM RASC NP

Block, eccentric locking collar, narrow ir ENP SYxxFM VAS VPxxE

Block, eccentric locking collar EWP -- RAS RPxxE

Block, low base with set screw UCPLL -- YAK NPLBlock, low base w/ecc locking collar, narrow ir ENLPL SYHxxFM VAK VPLxxE

Block, low base w/ecc locking collar EWPLL SYHxxWM RAK RPL

Flange, square, with set screw UCF FYxxTM RCJC SF

Flange, square, with set screw UCFX FYMxxTM -- MSF

Flange, square, w/ecc locking collar, narrow ir ENF FYxxFM VCJ VFxxEFlange, square, w/ecc locking collar EWFH FYxxWM RCJ RFxxE

Flange, oval, with set screw UCFL FYTxxTM RCJTC SFT


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Flange, oval, w/ecc locking collar, narrow ir ENFL FYTxxFM VCJT VFTxxE

Flange, oval, w/ecc locking collar EWFLH FYTxxWM RCJT --Flange, oval, w/ecc locking collar EWFL -- -- RFTxxE

Flange, pressed steel, oval w/set screw UBPFL -- -- SSFT

Flange, pressed steel, oval w/ecc locking collar ENPFL FTPxxFM RAT SSFTxxE

Flange, round, cartridge w/set screw UCFC -- -- SFC

Flange, round, cartridge w/ecc locking collar EWFC -- -- SFCxxE

Flange, offset, 3 bolt w/set screw UCFK -- -- RBTake-up type T TB RTU RT

P/N

Pressed steel cover Z *Y -- AVAIL

Cast iron cover C -- -- --

Standard series, metric 2XX XX XX S-2xxMedium series, metric 3XX -- -- --

Medium series, metric Xxx Mxx -- 53xx

Standard series, inch (see shaft size chart) 2xx-xxS x-x/x x-x/x -xx

Medium series, inch (see shaft size chart) 3xx-xxS x-x/x x-x/x -xx

Suffix

Spherical housing bore tolerance class J7 J

Inch size set screw in locking device U

Improved set screw design W

*Prefix



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Bearing Cross Reference.pdf

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