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FAG1
FAG Aerospace and Super Precision Bearings Division
Super Precision Bearings
The Barden Corporation
A Company of the FAG Kugelfischer Group
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FAG2
D I N I S O 9 0 0 1
REG.NR. 25 751-03
ZER
T IF I Z IERT
ES
Q
UALITTSMANAGEME
NTSY
STE
M
Super Precision Bearings
Publ. No. AC 41 130/3 EA
June 1998
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Contents
Miniature and Instrument Bearings . . . . . . . . . . . . . . . . 8Deep groove ball bearings, metric . . . . . . . . . . . . . . . . . . 11Deep groove ball bearings, inch . . . . . . . . . . . . . . . . . . . . 12Angular contact ball bearings, separable,non-separable, metric and inch . . . . . . . . . . . . . . . . . . . . 13
Deep Groove Ball Bearings . . . . . . . . . . . . . . . . . . . . . . . 14Deep groove ball bearings, metric . . . . . . . . . . . . . . . . . . 17
Life Calculation for Super Precision Bearings . . . . . . . . 56Dynamic equivalent loads . . . . . . . . . . . . . . . . . . . . . . . . 56Fatigue life ofminiature and instrument bearings . . . . . . . . . . . . . . . . . 57Modified life calculation . . . . . . . . . . . . . . . . . . . . . . . . . 58Static load . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
Lubrication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
Clamping Forces forBall Screw Support Bearings . . . . . . . . . . . . . . . . . . . . . . 67
Tolerances of Super Precision Bearings . . . . . . . . . . . . . 68Manufacturing Tolerances for Mating Parts . . . . . . . . . 72Bearing seats . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72Housing bores . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74Abutment dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . 76
Attainable Speeds . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84
Deflection and Rigidity . . . . . . . . . . . . . . . . . . . . . . . . . 85
Preload . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93
Spindle Bearing Sets . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98
Cages for Miniature and Instrument Bearings . . . . . . . . 99
Closures for Miniature and Instrument Bearings . . . . . . 102
Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103
Section 1Miniature and Instrument Bearings
Section 3Technical InformationEngineering
P4S a New Standard . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Advantages of Sealed Spindle Bearings . . . . . . . . . . . . . . 19
Advantages of Hybrid Spindle Bearings . . . . . . . . . . . . . 20
Spindle Bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22B719C., B70C., B72C., B719E., B70E., B72E. . . . . . . . 25HS-HSS719C., HSS70C., HSS719E., HSS70E. . . . . . . 30HC-HCS719C., HCS70C., HCS719E., HCS70E. . . . . 33
Ball Screw Support Bearings . . . . . . . . . . . . . . . . . . . . . . 367602, 7603, BSB . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Double Direction Angular Contact Thrust Ball Bearings 422344, 2347 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Cylindrical Roller Bearings . . . . . . . . . . . . . . . . . . . . . . . 48N10 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51NN30 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
Section 2
Super Precision BearingsAxial Thrust Ball BearingsCylindrical Roller Bearings
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Product Line
Miniature and Instrument Bearings(Page 8)
Ball Screw Support Bearings(Page 36)
Deep Groove Ball Bearings(Page 14)
Super Precision Spindle Bearings(Page 22)
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Product Line
Single Row Cylindrical Roller Bearings(Page 48)
Double Direction Angular Contact Thrust Ball Bearings(Page 42)
Double Row Cylindrical Roller Bearings(Page 48)
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FAG Kugelfischer Georg Schfer AG, Schweinfurt, Germany
The Barden Corporation (UK) Ltd, Plymouth, UK
Manufacturing Facilities
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Section 2Super Precision Bearings
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HSS HCS
P4S - A New StandardAdvantages of Sealed FAG HSS and HCS Spindle Bearings
Sealed FAG Spindle BearingsHSS and HCS- Maintenance Free and Lu-bricated for Life.
Grease is the common lubricant usedfor bearings in machine tool spindles. Itlowers lubrication and maintenancecosts, and improves the machinery envi-ronment to a large extent. Bearings
which are greased for life present an eco-nomical design solution.
Sealed HCS and HSS bearing areavailable in all sizes up to 130 mm diam-eter.
FAG is the first manufacturer ofsealed spindle bearings that are ready toassemble, lubricated for life, and there-fore maintenance free.
The following important advantagesof these sealed bearings have been con-firmed many times by manufacturers ofmachine tools and users alike :
- ease of handling during assembly- no washing- no greasing- no danger of contamination during
greasing or assembly- high level of cleanliness in the bearing -
precondition for a long working life- the correct type and quantity of grease
in the bearing- the type and quantity of grease and
sealing system are suited to one another- no frictional losses - the RSD is a non
contact seal- good sealing action both from outside
and inside effects- the grease base oil remains in the
bearing- air flow and ventilation through the
bearing are greatly reduced- the grease neither dries out nor is it
contaminated by polluted air flow- since additional sealing can be simlified
the moment arm is reduced- the grease stays in the bearing if the
spindle is inclined during operation- faster replacement of bearing, - but not
at the cost of cleanliness in the bearing
- exchangeable with bearings from the 70and 719 series.
The large internal space between therotating parts and stationary seals allowsa relatively large amount of grease, actingas a reservoir to provide extended operat-ing life of the bearing.
P4S - a new standard for high precision bearings with running accuracy improvedby 100 %
Precision class P4S Precision class P4
Spindle bearings of the series B.., HSS.., HS.., HCS.. and HC
...P4S ...P4
Runningaccuracy
Formt
olerance
Runningaccuracy
Formt
olerance
reduced
tolerance!
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1 2 3 4 5 6
100 %
140 %
155 %
B70 HS70 HC70
B
H C
Advantages of Hybrid Spindle Bearings
The service life of hybrid spindle bearings both with greaseand with oil lubrication is several times that of the life reachedby bearings with steel balls. Friction and adhesion between ce-ramic and steel, and consequently wear, are very low - speciallyat cold starts.
The high cleanliness standards in the area of rolling elementcontact is maintained with sealed bearings - preconditioned fora long bearing service life.
The sealing effect towards the inside and the outside retainsthe grease in the contact area. Contaminants cannot penetrateinto the bearing. Additionally damaging air flow through the
bearing is reduced.
The speed is about 55 percent higher than that of series Bbearings and about 15 percent higher than that of the HShigh-speed spindle bearings.
The small ball design of the HC bearings and the ceramicball material being approximately 60% lighter than steel re-duces centrifugal force and friction. The resulting excellentrunning properties are improved further by the advantageousrunning condition in the rolling contact zone.
This is also true of sealed designs because the seals are non-contacting.
Hybrid bearings are protected against seizure during starved
lubrication or dry running conditions by their excellent emer-gency running properties of low adhesion and friction.
HCSpindel bearingswith ceramic balls
BSpindel bearingswith steel balls
Relative running time
Speed
Frictiontorque
Speed
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HC
B
HS
HC
B
Rz= 0,905 mRt = 1,118 mRa= 0,109 m
lm
Advantages of Hybrid Spindle Bearings
Speed
Bearing bore
At the same speed the operating temperature is lower thanthat of bearings with steel balls.
Temperatures are increased by friction and friction is lowerwith the ceramic-steel combination.
Due to the low thermal conductivity of ceramic material theball keeps cool. Thermal expansion and changes in preloadand thus friction remain small.
Surface quality and precision of the work-pieces are im-proved with hybrid bearings. The excellent results obtainedwith grinding machines confirms this statement. This can beexplained by a number of reasons including the high modulusof elasticity of ceramic material and the large number of smallballs which make the bearing very rigid.
The advantages of grease lubrication can be maintained upto high-speeds. Thus the high expense of a complex oil lubrica-tion system can be saved.
This is made possible by cool running through excellenttribological properties of the ceramic material, and in particu-lar the dissimilar materials in contact.
Experience shows that the working life of the grease is
approx. 5 times longer, resulting in extended working life ofthe hybrid bearing.
Tem
peratureaboveambient
Speed
Filter0-500Scaling2.50 mP + V1.60 m
Example:External cylindrical grinding, Hub diameter 32 mm
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Spindle Bearings
Spindle Bearings
FAG Spindle bearings are single rowangular contact ball bearings of thehighest precision. Advantages offered bythe special design features of the contact
angle, cage and internal geometry are- higher rigidity- optimum rotational accuracy- excellent speedability- low vibration output
In machine tools and textile machineconstruction and in many other areas ofapplication the tendency is towards everhigher rotational speeds and ever greaterprecision.Various types are available to suit a widerange of specific operating conditions.- FAG spindle bearings from the B719,
B70 and B72 series
- FAG high speed spindle bearings fromthe HS719 and HS70 series
- FAG hybrid spindle bearings from theHC719 and HC70 series.
All spindle bearings have a contact an-gle of 15 (type C) or 25 (type E) andare available either as a universal bearingor as a bearing set.
The envelope dimensions of highspeed (HS) and hybrid spindle bearings(HC) are identical to the B series spindlebearings. The design characteristics al-low extreme speeds, low friction and heatbuild-up, contributing to lower demandson the lubricant and a longer workinglife.
They are also available as sealed units(HSS or HCS spindle bearings).
All series are produced in high preci-sion P4S quality (running accuracy toprecision P2 and envelope dimensions toprecision P4).
The relevant selection data and calcu-lation for spindle bearings can be foundon pages :
- Life Calculations Page 56-62- Lubrication Page 63-66- Tolerances Page 68-69- Manufacturing Tolerances
for Mating Parts Page 72-80- Attainable Speeds Page 84- Rigidity Page 85- Preload Page 93-96
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FAG 12
GERM
AN
Y
MB
-2
FAG
B7028E .T.P4S.UL
-5
Spindle Bearings
Cylindrical Grinding Spindle
Technical Data
Motor power: 11 kWSpeed: n = 7500 rpm
Bearing Selection
Cylindrical grinding demands highcutting efficiency for rough grinding aswell as accurate form and surface finishquality for fine finish grinding. Essentialcriteria for the bearings are high stiffnessand rotational accuracy whilst achievinga suitable speedability and good damp-
ing.Working end: 1 spindle bearing set
FAG HSS 7020C.T.P4S.QBCL in adouble tandem, back to back arrange-ment, fully clamped.
Drive end: 1 spindle bearing setFAG HSS 7020C.T.P4S.DBL in a backto back arrangement, floating.
Bearing Dimensions
The size of the bearing is determinedfrom the requisite spindle diameter orpredetermined outer housing diameter.The contact angle of 15 is favourable
Complete product nomenclature
Outer diametercalibration
Productioninformation
Inner bore calibration
Radial run-outmarking
for a high radial rigidity. By means of the4 bearing arrangement on the work sidethe damping and rotational accuracy isimproved.
Preload
Both bearing sets have a light preload.The two spacers are of identical widths.Their purpose is to reduce the thermaleffects through separation.
Lubrication and Sealing.
The sealed FAG HSS spindle bearingsare maintenance free and lubricated forlife with FAG Arcanol L74 bearinggrease.
A labyrinth with defined axial clear-ance of between 0.3...0.8 mm serves asan additional seal on the grinding wheelside. A simple labyrinth seal suffices onthe drive side.
Spindle Bearing Marking
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FAG13
B7008C.T.P4S.UL
Spindle Bearings
IR = Inner Ring
OR = Outer Ring
Type
B StandardOR relieved, IR symmetrical
HCB StandardOR relieved, IR symmetricalCeramic balls
HS High speed small ball bearingDouble relieved
HSS High speed bearing, sealedHC High speed ball bearing
Ceramic ballsHCS High speed ball bearing
Ceramic balls, sealed
Series
719 Light series70 Medium series72 Heavy series
Bore Diameter
00 10 mm01 12 mm02 15 mm03 17 mm04 4 5 = 20 mm05 5 5 = 25 mm
Contact Angle
C 15E 25
Standard Preloads
L LightM MediumH Heavy
Bearing Sets
U Single bearing, UniversalDU Duplex set,
UniversalTU Triplex set,
UniversalQU Quadruplex set,
UniversalPU Pentaplex set,
UniversalDB Duplex set,
Back to back
DF Duplex set,Face to face
DT Duplex set,Tandem
TBT Triplex set,Tandem, back to back
QBC Quadruplex set,
Double tandem, back to back
Precision
P4S FAG tolerance, better thanISO P4
Cage
T Phenolic, OR riding
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Ball Screw Support Bearings
FAG ball screw support bearings havebeen developed especially for ball screwspindle support. They fulfil the require-
ment for- high accuracy- greater rigidity- low friction- quick positional changes at high speed
FAG ball screw support bearings aremanufactured in the 02 (7602),03 (7603) size series and also the nar-rower BSB series.
FAG ball screw support bearings forball screw spindle support are producedin ISO P4 quality.
The tolerance of the diameters is thesame as those of the deep groove bearing,
Ball Screw Support Bearings
the axial runout corresponds to the toler-ance values of the thrust bearings.
In order that the ball screw drives
achieve the desired high positional accu-racy in machine tools the bearings re-quire a high rigidity.
FAG ball screw support bearings forball screw drives achieve their rigiditythrough their internal design and built-in universal preload.
The assembly of many bearings in anDF or DB arrangement increases thepreload and stiffness of the bearing.
FAG ball screw support bearings forball screw drives exhibit low friction. Forthis reason a lower driving power is re-quired. Torque values are given in thebearing tables.
Lithium soap greases with EP addi-tives, for example FAG bearing greaseArcanol L135V have proved themselves
as lubricating greases.
The relevant selection data and calcu-lation for single row ball screw supportbearings, high precision series, can befound on pages :
- Life Calculations Page 56-62- Lubrication Page 63-66- Clamping Force Page 67- Tolerances Page 68-69- Manufacturing Tolerances
for Mating Parts Page 72-81- Attainable speeds Page 84- Rigidity Page 86-87
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Ball Screw Support Bearings
Ball Screw Spindle Support
Bearing Selection
The bearing must support the spindleaccurately with great axial rigidity. Formany years the FAG ball screw supportbearings with 60 degree contact angleand precision class P4 have proven them-
selves for these requirements.Each spindle end is supported by
4 bearings FAG 7602025TVP in a Tan-dem, back to back arrangement.
The spindle is fixed at both ends andis tensioned in its ambient state, so thatthe operating temperature doesnt causeany additional axial forces on the bear-ings through thermal expansion.
Bearing Dimensions
The size of the bearing is determinedby the application loads and the spindlespeed. In most cases ball screw drives are
Lubrication, Sealing
In the bearing 35 % of the free spaceis filled with a high grade EP grease,FAG Arcanol L135V, for lifelong lubrica-tion.
Experience has shown that this grease
has an average working life of more than5 years. Sealing achieved by either a laby-rinth or NBR seal within the casing isrecommended.
driven without any lateral force, so thatthe axial force is the determining factorfor the dimensioning of the bearing.Prerequisites for attaining durability aregenerally favourable operating conditionsand high grade grease with EP additives.Individual applications can be confirmed
by checking the hertzian contact stresscalculating the extended working life.The number of bearings determines theaxial rigidity.
Preload, Bearing Clearance
FAG ball screw support bearings fromthe 76020.., 76030.. and BSB series areavailable universally preloaded for instal-lation in either DF, DB or Tandem ar-rangements. The installation in DF orDB arrangements results in a specificpreload. The bearings have a preloadwhich achieves the high rigidity required.
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FAG16
7602035TVP
BSB030062T
Ball Screw Support Bearings
Series Type Number
7602 Dimensional series 027603 Dimensional series 03
Bore
Actual size in mm
Cage
TVP PA66-GF25
Series Type Number
BSB Ball screw support bearing
Bore Diameter
Actual size in mm
Cage
T PA66-GF25
Outer Ring Diameter
Actual size in mm
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FAG17
Double Direction Angular Contact Thrust Ball Bearings
Double Direction Angular Contact Thrust Ball Bearings
Double direction angular contactthrust ball bearings were developed formachine tool spindles and are manufac-tured solely high precision. In the case of
main spindles of machine tools thesebearings carry the axial forces. They arematched with the mounting dimensionsof the double row cylindrical roller bear-ing of the NN30 series, (page 48).
External Dimensions
Double direction angular contactthrust ball bearings are mounted next toa double row radial cylindrical rollerbearing. The nominal size of the externaldiameter is the same for both bearings.This simplifies the machining of the
housing bore. The tolerance for the ex-ternal diameter of the double directionangular contact thrust ball bearing is de-signed so that the bearings are clear in
the housing bore.
Bearing Design
Double direction angular contactthrust ball bearings have a contact angleof 60and are axially preloaded. Theyare therefore especially well suited forhigh speeds. The contact angle and theaxial preload ensures good ball control,particularly under the centrifugal forceswith fast rotating spindles.
They have solid one piece brass cageswhich are ball guided.
Speedability
FAG double direction angular contactthrust ball bearings are suitable for high
speeds. Speed limit values for grease andoil lubrication are given in the bearingtables.
Lubrication
FAG double direction angular contactthrust ball bearings can be lubricatedwith grease or oil.
The outer ring O.D. has a lubricatinggroove in the centre with lubricatingholes. The application of the lubricantbetween the two rows of balls maximisesthe distribution of lubricant to bothraceways.
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Double Direction Angular Contact Thrust Ball Bearings
Drill and Milling Spindle
Technical Details
Motor power: 20 kWRotational speed: 11 ... 2240 rpm
Bearing Selection
The radial and axial forces are sup-ported separately. Double row cylindri-
cal roller bearings are incorporated as ra-dial bearings; on the drive side aFAG NN3024ASK.M.SP and aNN3020ASK.M.SP on the oppositeside.
The double direction angular contactthrust ball bearings FAG 234424M.SPlocates the spindle axially. This bearinghas a set preload making adjustments un-necessary. Due to the external diametersof the radial and axial bearings havingthe same nominal size machining of thebore for the housing is simplified. Thetolerance of the double direction angular
contact thrust ball bearings is such thatthere is a clearance fit in the housing.
Lubrication, Sealing
Oil re-circulation lubrication. TheLabyrinth seal on the work side is madeup of ready to assemble components.The inner labyrinth ring retains the lu-
bricating oil, whilst the outer labyrinthring excludes the cutting fluid.
Rigidity
To attain good machining results thebearings for machine tool spindles mustexhibit high rigidity as well as high preci-sion; this means that they must run pre-cisely and must allow only slight deflec-tion under load. The double directionangular contact thrust ball bearings gain
their rigidity through their internal de-sign and preload.
The relevant selection data and calcu-lation for double direction angular con-tact thrust ball bearings can be found onpages :
- Life Calculations Page 56-62- Lubrication Page 63-66- Tolerances Page 68-69- Manufacturing Tolerances
for Mating Parts Page 72-82- Attainable speed Page 84- Rigidity Page 88
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234424M.SP
Double Direction Angular Contact Thrust Ball Bearings
Series Type Number
2344 For assembly on the smaller sideof the NN30 taper
2347 For assembly on the larger sideof the NN30 taper
Bore Size Code
10 10 5 = 50 mm18 18 5 = 90 mm
Precision
SP Super precisionUP Ultra precision
Cage
M Brass cage
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Cylindrical Roller Bearings
Cylindrical Roller Bearings
FAG produces cylindrical roller bear-ings of super precision in the series N10and NN30.
The double row bearings are used inapplications where a :- radially stiff- high capacity- high precision support is required.
Any axial load would be taken up bythe double direction angular contactthrust bearings of the series 2344 (seepage 42).
The single row bearing would bemostly used as the loose bearing in
combination with FAG spindle bearingsas fixed bearings.
Bearing Design
Double row cylindrical roller bearings
have a high load carrying capacity thanksto the high number of cylindrical rollersin each row.
The cage is of robust solid brass con-struction.
Single row cylindrical roller bearingsalso have a solid brass cage and are spe-cially designed for the demands of highspeed spindles.
The bearing bore is tapered (taper1:12). The desired radial preload or ra-
dial clearance can be set by an axial ad-justment on the conical shaft.
Lubrication
FAG cylindrical roller bearings can be
lubricated with either grease or oil.For this purpose the double row bear-
ings have a lubricating groove and lubri-cating hole in the middle of the outerring.
Selection data and calculations for su-per precision cylindrical roller bearingscan be found as follows:- Life Calculations Page 56-62- Lubrication Page 63-66- Tolerances Page 68-70- Manufacturing Tolerances
for Mating Parts Page 72-83
- Attainable speed Page 84- Rigidity Page 88
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FAG22
NN3008ASK.M.SP.C2
Cylindrical Roller Bearings
Dimensions in mmNominal Over 30 40 50 65 80 100 120 140 160 180 200 225 250 280 315 355 400 450bearing bore to 30 40 50 65 80 100 120 140 160 180 200 225 250 280 315 355 400 450 500
Bearing Design Radial play in m
ASK.M.SP, min 15 15 17 20 25 35 40 45 50 55 60 60 65 75 80 90 100 110 120ASK.M.UP, K.M1.SP max 25 25 30 35 40 55 60 70 75 85 90 95 100 110 120 135 150 170 190
ASK.M.SP.C2, min 20 20 25 30 35 40 50 55 60 75 85 95 105 115 130 145 165 185 205
ASK.M.UP.C2 max 45 45 55 60 70 75 90 100 110 125 140 155 170 185 205 225 255 285 315
Radial play of FAG Cylindrical Roller Bearings with tapered bore
Type
N Single row,shoulders on the IR
NN Double row,shoulders on the IR
Dimensional Series
10 Single row bearings30 Double row bearings
Bore Size Code
06 6 5 = 30 mm08 8 5 = 40 mm/500 500 mm
Radial Play
C2 Radial per standardsR40.50 Special radial play
Precision
SP Super precision
UP Ultra precision
Cage
M1 Brass cage single rowM Brass cage double row
Tapered Bore
K Tapered bore,single row bearing
ASK Tapered bore, lubricationholes in OR double rowbearing
IR = Inner RingOR = Outer Ring
The standard radial clearance of Precision SP and UP is C1NA.
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Section 3Technical Information, Engineering
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Spindle Bearings - Sets
57: Bearing Set Arrangements
DBBack to back arrangement
DFFace to face arrangement
DTTandem arrangement
TBTCombination of tandem andback to back arrangement
TFTCombination of tandem andface to face arrangement
TTTandem arrangement
QBCBack to back arrangement
QFCFace to face arrangement
QTTandem arrangement
QBTCombination of tandem and
back to back arrangement
QFTCombination of tandem and
face to face arrangement
Nomenclature for BearingSets.
The nomenclature consist of two orthree letters.
First LetterNumber of bearings in set
D 2 bearings (Duplex)T 3 Bearings (Triplex)
Q 4 bearings (Quadruplex)P 5 bearings (Pentaplex)S 6 bearings (Sestuplex)
Second and Third LettersArrangement of the bearings in a set
U UniversalB Back to back F Face to faceT TandemBT Back to back arrangement against a
tandem set with 2,3 or 4 bearingsFT Face to face arrangement against a
tandem set with 2,3 or 4 bearingsBC Back to back arrangement; tandempair against a tandem set with 2,3 or4 bearings
FC Face to face arrangement; tandempair against a tandem set with 2,3 or4 bearings
Fourth LetterPreload
L LightM MediumH Heavy
Examples of Nomenclature
FAG HS7015C.T.P4S.DUL2 bearings universally preloaded in onepackage (can be assembled in any con-figuration).In universal bearing sets the bore andOD tolerances are matched.
FAG B7015E.T.P4S.TBTL3 bearings in tandem back to back ar-rangement.
Bearing sets with different contact an-gles, larger sets or special preloads on en-quiry.
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FAG25
Highest Reliability of FAG High Precision Bearings inExtreme Operating Conditions
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FAG Aircraft/Super Precision Bearings GmbHGeorg-Schfer-Str. 30 D-97421 SchweinfurtPhone 49-(0) 97 21-91 33 72 Fax 49-(0) 97 21-91 36 66
The Barden CorporationP.O. Box 2449 200 Park AvenueDanbury, Connecticut 06813-2449Phone 203-744-2211 Fax 203-744-3756
The Barden Corporation (UK)Plymbridge Road EstoverPlymouth PL6 7LH DevonPhone 44-(0) 17 52-73 55 55 Fax 44-(0) 17 52-73 34 81
Production Facilities for Super Precision Bearings of theFAG Aerospace and Super Precision Bearings Division:
