fag aerospace and super precision bearings division … mhxanwn/pdf apo fag/… · fag aerospace...

FAG1

FAG Aerospace and Super Precision Bearings Division

Super Precision Bearings

The Barden CorporationA Company of the FAG Kugelfischer Group

FAG2

D I N I S O 9 0 0 1

REG.NR. 25 751-03

ZE

R T I F I Z I E R T ES

QUALITÄTSMANAGEMENTSYSTE

M

Super Precision Bearings

Publ. No. AC 41 130/3 EA

June 1998

FAG3

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 . . . . . . . . . . . . . 68

Manufacturing 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 2Super Precision BearingsAxial Thrust Ball BearingsCylindrical Roller Bearings

FAG4

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)

FAG5

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)

FAG6

FAG Kugelfischer Georg Schäfer AG, Schweinfurt, Germany

The Barden Corporation (UK) Ltd, Plymouth, UK

Manufacturing Facilities

FAG7

Section 2Super Precision Bearings

FAG8

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. Bearingswhich 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

Run

ning

acc

urac

y

Form

tol

eran

ce

Run

ning

acc

urac

y

Form

tol

eran

ce

reduced

tolerance!

FAG9

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 thebearing 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 starvedlubrication 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

Sp

eed

Fric

tion

torq

ue

Speed

FAG10

HC

B

HS

HC

B

Rz = 0,905 µmRt = 1,118 µmRa = 0,109 µm

lm

Advantages of Hybrid Spindle Bearings

Sp

eed

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 isapprox. 5 times longer, resulting in extended working life ofthe hybrid bearing.

Tem

per

atur

e ab

ove

amb

ient

Speed

Filter0-500Scaling2.50 µmP + V1.60 µm

Example:External cylindrical grinding, Hub diameter 32 mm

FAG 11

Spindle Bearings

Spindle Bearings

FAG Spindle bearings are single rowangular contact ball bearings of thehighest precision. Advantages offered bythe special design features of the contactangle, 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 15º (type C) or 25º (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

FAG 12

GE

RM

AN

YM

·B

‹-2›

FAGB7028E.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 setFAG 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 15º 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

FAG13

B7008C.T.P4S.UL

Spindle Bearings

IR = Inner RingOR = 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 15°E 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

FAG14

Ball Screw Support Bearings

FAG ball screw support bearings havebeen developed especially for ball screwspindle support. They fulfil the require-ment forhigh 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,


the axial runout corresponds to the toler-ance values of the thrust bearings.

In order that the ball screw drivesachieve 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 themselvesas 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

FAG15


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 by4 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 doesn’t 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 greasehas 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 confirmedby 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.

FAG16

7602035TVP

BSB030062T


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

FAG17

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 ofmain 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 inthe housing bore.

Bearing Design

Double direction angular contactthrust ball bearings have a contact angleof 60° and 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 highspeeds. 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.

FAG18


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.


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 gaintheir 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

FAG19

234424M.SP


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

FAG20

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 incombination with FAG spindle bearingsas ‘fixed’ bearings.

Bearing Design

Double row cylindrical roller bearingshave 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 belubricated 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

FAG21


Technical Data

Motor power: 25 kWSpeed: 31.5....5000 rpm

Bearing Selection

The bearings must support the spin-dle both axially and radially precisely andrigidly. The bearings are preloaded andmanufactured to super precision toler-ances.

Work side: 1 spindle bearing set FAGB7018E.T.P4S.TBTL in a Tandem, backto back arrangement as a fixed bearing.

Diven side: single row cylindricalroller bearings FAG N1016K.M1.SP as afloating bearing. The arrangement issuited to high speeds and high cuttingefficiency.

Bearing Dimensions

The bearing size is determined princi-pally by the required spindle rigidity, i.e.the spindle diameter.

The fatigue life of the bearing istaken into consideration during selec-

tion, however, in practice it does not fig-ure greatly. As the grease working lifeand the Hertzian contact stresses inthe rolling bearing are the decisive fac-tors.

Main spindles do not as a rule fail onaccount of fatigue, but instead because ofwear.

Preload, Bearing Clearance

FAG spindle bearings are delivered insets for different arrangements. Theyhave a set light preload suitable for theapplication requirement.

The cylindrical roller bearing is set al-most without clearance by press fittingthe tapered inner ring on to the spindle.


The bearings are lubricated for lifewith FAG bearing grease Arcanol L74V.

The free space in spindle bearings isfilled to ca. 35 % and with cylindricalroller bearings to ca. 20 %.

Sealing is accomplished via a labyrinthwith discrete narrow radial gaps.

The Main Spindle of a CNC Lathe.

FAG22

NN3008ASK.M.SP.C2


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 µm

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 205ASK.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 precisionUP 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.

FAG23

Section 3Technical Information, Engineering

FAG24

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 andback to back arrangement

QFTCombination of tandem andface 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 backF 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; tandem

pair 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.

FAG25

Highest Reliability of FAG High Precision Bearings inExtreme Operating Conditions

FAG26

FAG Aircraft/Super Precision Bearings GmbHGeorg-Schäfer-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:

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