brg.designation

8/18/2019 Brg.designation

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2005-03-24 ©SKF Slide 1SKF [L&D, Company HR]

SKF Bearing

Designations

Bearings in Machine Design

D K Sen

26th – 29th April 2005


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ISO standards

InternationalOrganization forStandardization

ISOISO


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ISO standards

or Metric Sizeor Metric SizeBearingsBearings


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ABMA standards

A!ericanBearing

Man"fact"rers

Association

ABMAABMA


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ABMA standards

or Inch Sizeor Inch SizeBearingsBearings


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1-04-1! ©SKF Slide [Code]SKF ["#$ani%aion]

Bearing Designations

Basic Designations S"pple!entar# Designations


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$he %asic designation identi&es'

( )rod"ct t#pe( Standard design( Size

$he s"pple!entar# designationidenti&es'

( Alternati*e design +*ariants,

( Bearing co!ponents( $#pes of special %earings



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-Basic Designation

1-04-1! ©SKF Slide ' [Code]SKF ["#$ani%aion]


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Metric Designation System


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Metric Designation System

.onsists of 5 digits

irst digit denotes Bearing $#pe

Second digit denotes /idth

$hird digit denotes OD

o"rth 1 &fth digits denote ID

eight


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Diameter and Width Series


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Diameter and Width Series


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Cylindrical Roller Bearings

NU NJ NUP

N NU + HJ NJ + HJ


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Inch Designation System

L L L L

Bearingt#pe

Bearingseries

Bore-34s

of inch


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Standard Inch Size Bearing Types

DBB

A.BB

SABB

.B

7S MS

A7S AMS

7 M

.7 .M

7 ' light series M ' !edi"! series


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Inch Size TRB

Inch taper rollerbearings are designed

around roller & cageassemblies, and belongto families


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Inch Designation System


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2SpplementaryDesignations !

1-04-1! ©SKF Slide 1' [Code]SKF ["#$ani%aion]


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S"pple!entar# designation consist

)re&8es

S"8es

Spplementary Designations !


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:sed to identif# co!ponents of a %eari :s"all# follo;ed %# the %earing design

"re#$es o% Metric Size Bearings!

S o"sing ;asher of a .#lindrical roller thr"st

%earingK .#lindrical roller and cage thr"st asse!%l#7 Separate inner or o"ter ring of a separa%le%earing Inner or o"ter ring ;ith roller 1 cage

asse!%l# of a separa%le %earing/ Stainless Steel deep groo*e %all %earing/S Shaft ;asher of a c#lindrical roller thr"st%earing


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S&$es o% Metric Size Bearings!

S"8es identif#'

( ?ariants – de*iations fro! standard design

( ro"ped into fo"r categories

( Added to %asic designation in a speci&corder@ ;here

!ore than one de*iation applies


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S&$es o% Metric Size Bearings!

.ategor# - ' Modi&ed InternalDesign

.ategor# 2 ' Modi&ed =8ternalDesign

.ategor# ' Modi&ed .age Design

.ategor# ' Modi&cations toenhance )erfor!ance


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A A.

B B=

. and co!%inations thereof

.A.B...A.

D

= =.

S&$ Category '! Modi#ed InternalDesign


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A ' C $ransitional Designation changed later eg@ 2-0 A ' DDBB ;itho"t &lling sl C .ontact Angle 00 in SA.BB

eg@ E056 A

B ' C .ontact Angle 00 in SA.BB eg@ E2-0 B C Steep .ontact Angle in $B eg@ 22-0 B


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. ' C .ontact Angle -50 in SA.BB eg@ E0-2 .

C SB ;ith loose "ide lange @ s#!!et

rollers 1 pressed steel cage of ;indo

A. 'C .ontact Angle 250 in SA.BB eg@ E2-0 A. D 'C DA.BB ;ith t;o part Inner ing and

.ontact Angle of 50


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= ' C 7arger %all or oller dia!eter eg@ 2920 =

.A ' C SB ;ith loose g"ide ring %"t t;o integra ;ith !achined %rass cage eg@ 2-30 .A C A.BB for "ni*ersal !o"nting ;ith lo; a8 clearance ;hen !o"nted in pair

.A.' C SB of .A design %"t ;ith i!pro*ed rolle g"idance


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.B ' C A.BB for "ni*ersal !o"nting ;ith a8ialclearance larger than .A ;hen !o"nted

.. ' C A.BB for "ni*ersal !o"nting ;ith a8ial

clearance larger than .B ;hen !o"nted C SB of . design %"t ;ith i!pro*ed rolle g"idance

=. ' C Single o; .B ;ith a greater n"!%er of

larger rollers than the original design@ a increased a8ial load carr#ing capacit# in

langed e8ec"tions


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A ' C A.BB for "ni*ersal !o"nting ;ith ligh preload ;hen !o"nted in pair

B ' C A.BB for "ni*ersal !o"nting ;ith a8ia preload larger than A ;hen !o"nte . ' C A.BB for "ni*ersal !o"nting ;ith a8ia

preload larger than B ;hen !o"nte


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S&$ Category (! Modi#ed )$ternalDesign

S"8 K

S"8K0

$aper -'-2

$aper -'0


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K ' C $apered Bore + $aper - ' -2 ,K 0 ' C $apered Bore + $aper - ' 0 ,G ' C Snap ring groo*e on %earing o"ter dia!G- ' C One locating slot on o"tside edge of o"tG2 ' C $;o dia!etricall# opposite locating slot o"tside edge of o"ter ringG ' C G H G2 7ocating slots on side opposite

snap ring groo*eG6 ' C G H G2 7ocating slots on sa!e side as s

ring groo*eG ' C Snap ring groo*e on %earing o"ter dia! along ;ith an appropriate snap ring

& di# d l


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) ' C SB ;ith t;o part o"ter ring

) ' C SB ;ith t;o part o"ter ring@ ;ith cali% spacer in %et;een

' C Integral Fange on o"ter ring o"ter dia C .ro;ned r"nner s"rface +$rac r"nner

J ' C One or !ore of %earing e8ternal di!en

altered to f"ll# co!pl# ;ith ISO stan

S & C ( M di# d ) l


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Shields and Seals

Shield *o+,%riction Seal Contact Seal

RS* RS* R-- RS.RS. RS'

S & C t ( M di# d ) t l


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S ' C .ontact seal of s#nthetic r"%%er ;ith or;itho"t sheet steel reinforce!ent on one

2S ' C .ontact seals of s#nthetic r"%%er ;ith sh steel reinforce!ent on t;o sides

S- ' C .ontact seal of acr#lonitrile %"tadiene r" +GB, ;ith sheet steel reinforce!ent on o

2S-' C .ontact seal of acr#lonitrile %"tadiene r" +GB, ;ith sheet steel reinforce!ent on t

S-


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S2 ' C .ontact seal of F"oro r"%%er +)M, ;ithsteel reinforce!ent on one side

2S2' C .ontact seal of F"oro r"%%er +)M, ;it steel reinforce!ent on t;o sides

S ' C .ontact seal of acr#lonitrile %"tadiene+GB, ;ith sheet steel reinforce!ent o

side2S' C .ontact seal of acr#lonitrile %"tadiene

+GB, ;ith sheet steel reinforce!ent o sides

S & C t ( M di# d ) t l


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S7 ' C 7o; friction contact seal of acr#lonitrile%"tadiene r"%%er +GB, ;ith sheet stee

reinforce!ent on one side2S7' C 7o; friction contact seal of acr#lonitril %"tadiene r"%%er +GB, ;ith sheet st reinforce!ent on t;o sides< ' C 7o; friction seal of acr#lonitrile %"tadi r"%%er +GB, ;ith sheet steel reinforc on one side

2< ' C 7o; friction seal of acr#lonitrile %"tadi r"%%er +GB, ;ith sheet steel reinforce

on t;o sides

S & C t ( M di# d ) t l


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1-04-1! ©SKFSlide 3 [Code]SKF ["#$ani%aion]


eL"ire!ent Shields 7o;friction seals .ontact seals

< S7 < S S-

7o; friction HHH HH HHH o o

igh speeds HHH HHH HHH o o

rease retention o HHH H HHH HH

D"st e8cl"sion o HH H HHH HHH

/ater e8cl"sion

static o HHH HH

d#na!ic o H H

high press"re o HHH o

S#!%ols ' HHH e8cellent HH *er# good H good o fair notreco!!ended

S & C t ( M di# d ) t l


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ICOS oil sealed /earing nits

Designation ! ICOS 0 D'B$$,T12

S & C t ( M di# d ) t l


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< ' C Shield of pressed sheet steel &ttedon one side

2< ' C Shield of pressed sheet steel &ttedon t;o sides


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S&$ Category 3! Modi#ed Cage Design

Cage Centering Types


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' C Machined Steel or S Iron cageA ' C .age centred on o"ter ring

B ' C .age centred on inner ring

= ' C Machined Steel .age phosphated ' C )ressed cage of hardened sheetsteel ' C )ressed cage of "nhardenedsheet steel

A ' C .age centred on o"ter ring = ' C .age phosphated7 ' C Machined light allo# cage7A ' C 7 .age centred on o"ter ring

C


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M ' C Machined %rass cage centred onrollersMA ' C M cage centred on o"ter ring

MB ' C M cage centred on inner ringM7 ' C One piece %rass ;indo; t#pe cage

centred on inner or o"ter ringM) ' C One piece %rass ;indo; t#pe cage@

;ith p"nched or rea!ed pocets@centred on inner or o"ter ring


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) ' C Mo"lded cage !ade of glass&%re reinforced pol#a!ide 66

$G ' C Mo"lded cage !ade of plastic

N ' C )ressed Brass cage

? ' C "ll co!ple!ent %earing+ ;itho"t cage ,


Category 4! Modi#cations to enhance


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Category 4! Modi#cations to enhance"er%ormance

.7EA ' C Standard SK L"alit# for )inion B.7E. ' C Special SK L"alit# for )inion Be

.G ' C Gor!al internal clearance $his "s"all

follo;ed %# M7) to denote partdisplaced range eg' .G ' C :pper half of Gor!al

.GM ' C $;o !iddle L"arters of Gor! .G7 ' C 7o;er half of Gor!al

.G) ' C :pper half of Gor!al 17o;er half of .



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.- ' C Internal clearance less than .2.2 ' C Internal clearance less than Gor!al

. ' C Internal clearance !ore than Gor!al. ' C Internal clearance !ore than ..5 ' C Internal clearance !ore than .

A letter M7) follo;ing the clearanc designation denotes part or displaced


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Internal Clearance


.- clearance less than C(

.2 clearance less than 1ormal

. clearance greater than1ormal. clearance greater than C3.5 clearance greater than C4

adial internal clearance

Axial internal clearance


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In5encing "arameters

1-04-1! ©SKF Slide 4 [Code]

SKF ["#$ani%aion]

COLD

WARM

it

eat

Speed

7oad

Expansion

Compression

Reducedradial

clearance


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)6ect on Bearing *i%e

1-04-1! ©SKF Slide 4! [Code]

SKF ["#$ani%aion]

Relati7e /asic rating li%e *'89 :

"reloading Clearance

*oad Distri/tion de to Clearance


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*oad Distri/tion de to ClearanceChanges

1-04-1! ©SKF Slide 4' [Code]

SKF ["#$ani%aion]



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1-04-1! ©SKF Slide 4( [Code]

SKF ["#$ani%aion]


.0- ' C ed"ced tolerance for r"nningacc"rac# of I.02 ' C =8tra red"ced tolerance for r"nningacc"rac#

of I ' less than .0-.0 ' C ed"ced tolerance for r"nningacc"rac# of O.0 ' C =8tra red"ced tolerance for r"nningacc"rac#

of O ' less than .0

.05 ' C .0- H .0.06 ' C .02 H .0

.0E ' C .0- H .0



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SKF ["#$ani%aion]


.-0 ' C ed"ced tolerance for %ore 1 ODIn case of tapered %ore@ refers to

onl# OD

.20 ' C Bore dia!eter tolerance less than.-0.0 ' C ed"ced %ore dia!eter tolerance@to;ards

standard !ini!"! li!it.0 ' C OD tolerance less than .-0

.50 ' C ed"ced OD tolerance@ to;ardsstandard !ini!"! li!it



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SKF ["#$ani%aion]


.60 ' C .20 H .50.E0 ' C .20 H .0.30 ' C ed"ced heighttolerancefor thr"st %earings.-5 ' C .-0 H .05.-3 ' C .-0 H .03

.E3 ' C .E0 H .03



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SKF ["#$ani%aion]


/DB : * Two single row DGBB/ACBB/TRB, paired for mounting in backtoback arrangement!

/D" : * Two single row DGBB/ACBB/TRB, paired

for mounting in facetoface arrangement!

/DT : * Two single row DGBB/ACBB/TRB, paired

for mounting in tandem

/#A : * Case $ardened bearing or bearing components!

"or closer identification, it is followed b% one of

following numbers : &/'/(/)//+//- e!g!,

' Bot$ rings ( .uter ring

+ Rolling elements etc!



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SKF ["#$ani%aion]


$ ' C Bearing s"pplied ;ith igh $e!perat + "pto H-00 ., grease7$ ' C Bearing s"pplied ;ith 7o; as ;ell as

$e!perat"re + 0 to H-00

., grea7$ ' C Bearing s"pplied ;ith 7o; $e!perat" + "pto 500 ., greaseM$ ' C Bearing s"pplied ;ith Medi"! $e!pe + 0 to H--00 ., grease


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SKF ;reases %or sealed D;BB


SKF ["#$ani%aion]

$echnical Standard greases Special greases

speci&cations

7$-0 M$E M$ G $22 7$20 /B 7$2

$hicener 7ithi"!

7ithi"! 7ithi"! )ol#"rea

7ithi"! 7ithi"! )ol#"rea

7ithi"!soap soap soap soap co!ple

8soap soap soap

soap

Base oil t#pe Diester oil

Mineraloil

Mineraloil

Mineraloil

Mineraloil

Diesteroil

=steroil

=steroil

G7Iconsistenc#

2 2 2 2 2 2

class

Operating 50 toH90 0 toH--0 0 toH-20 0 toH-50 20 toH-0 55 toH--0 0 toH-60 50 toH-0te!perat"re@.


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;rease #lling degree


SKF ["#$ani%aion]

grease


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Main grease #lling degrees


SKF ["#$ani%aion]

7ary %rom '8 to '88 : o% the %ree 7olme

identi#ed /y a digit %rom ' to 2

1ormal ! (> , 3> :

Special !

'8 , '> : ?'8 , (8 : +hen d@'8 mm code ' A

4> , 8 : code B

8 , '88 : code 2 C

#ll ?related to ns+ept 7olme code >

S ; % l d ;


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SKF ;reases %or sealed D;BB

1-04-1! ©SKF Slide 5! [Code]

SKF ["#$ani%aion]

no grease s&$

standard grease

standard grease #lling degree



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1-04-1! ©SKF Slide 5' [Code]

SKF ["#$ani%aion]


) ' C Di!ensional and r"nning acc"rac# to IS tolerance class )A ' C Di!ensional acc"rac# to ISO tolerance c and and r"nning acc"rac# to ABMA)5 ' C Di!ensional and r"nning acc"rac# to IS

tolerance class 5 + More acc"rate tha)6 ' C Di!ensional and r"nning acc"rac# to IS tolerance class 6) ' C ) H .

)52 ' C )5 H .2)62 ' C )6 H .2)A9 ' C Di!ensional and r"nning acc"rac# to A

class 9


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" i i l


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"recision class


SKF ["#$ani%aion]

1µ

How much is a µ?

Ahumanhair

0,06 mmStandard

High precisionbearing

Precisionbearing

Normal

P6 P6

SP

P4A

UP

PA9A

PA9B

Tolerance

classes

0/-15 µm0/-12 µm

0/-9 µm 0/-7 µm0/-2,5 µm



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SKF ["#$ani%aion]


S) ' C Special )recision@ di!ensional acc"rac# a

corresponding to )5 and r"nning acc"rac appro8 to )S0 ' C Bearing ring di!ensionall# sta%ilized to o

te!perat"res "pto H -500.

S- ' C Bearing ring di!ensionall# sta%ilized to o te!perat"res "pto H 2000.S2 ' C Bearing ring di!ensionall# sta%ilized to o

te!perat"res "pto H 2500.S ' C Bearing ring di!ensionall# sta%ilized to o

te!perat"res "pto H 000.S ' C Bearing ring di!ensionall# sta%ilized to o

te!perat"res "pto H 500.



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SKF ["#$ani%aion]


:) ' C :ltra )recision@ di!ensional acc"rac# ap corresponding to ) and r"nning acc"rac

%etter than )/20' C $hree l"%rication holes in o"ter ring

/' C 7"%ricating groo*e and three l"%ricationin o"ter ring?8888' C ? pl"s a second letter follo;ed %# a thr n"!%er denoting *ariants not co*ered

PlogicalQ s"pple!entar# designations

?A 20- ' Bearings for Kiln $r"cs ?A 0- ' Bearings for $raction Motors



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SKF ["#$ani%aion]


? n"!%er speci&cations '

(?A ' Application oriented *arients(?B ' Bo"ndar# di!ension de*iations(?. ' Material andor heat treat!ent @ !ainl#

hardening(?= ' =8ternal and also so!e internal de*iations(? ' Other *ariants referred to %efore hard!achining(?' .age *ariants +other than co*ered "nder

? ,(?' eat treat!ent after hardening(?' Matched %earing sets

+single %earings prepared for pairing,(?K' Maring 1 pacaging(?7' Special s"rface or s"rface treat!ent –

!echanical@ che!ical @ etc



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SKF ["#$ani%aion]


? n"!%er speci&cations '

(?M ' Asse!%ling prescriptions(?) ' Sealed @ shielded(?R ' R"alit# @ di!ensions @ acc"rac# @ *i%ration@

torL"e test(? ' inal inspection eL"iring certi&cates@ safet#acts etc(?S ' .learance and preload(?$' 7"%rication(?:' Other *ariants referred to grinding andasse!%ling(?/' Man"fact"ring stages on %earing parts(?J' Bearing parts not referred to in %earingdesignations(?


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SKF ["#$ani%aion]

g y"er%ormance

/here t;o s"8es follo; one another@ the&rst

ending ;ith a &g"re and the second

starting ;ith

one@ a stroe is to %e "sed

eg' 6-0 . 6025-



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1-04-1! ©SKF Slide [Code]

SKF ["#$ani%aion]

g y"er%ormance

/here a s"8 for a di*ided clearance rangeis follo;ed %# a s"8 for t#pe of grease@ a

stroe is to %e "sedeg ' 62052


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1-04-1! ©SKF Slide ! [Code]

SKF ["#$ani%aion]

g y"er%ormance

$he seL"ence of categor# s"8es isas follo;s '

- Materials @ heat treat!ent

2 )recision @ clearance @ L"ietr"nning

Bearing sets @ paired %earings

Sta%ilization

5 7"%rication

6 Other *ariants



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1-04-1! ©SKF Slide ' [Code]

SKF ["#$ani%aion]


$he seL"ence of ;riting the

designations'

( )re&8 – if an#

( Basic designation

( S"pple!entar# designation of categor# -

( S"pple!entar# designation of categor# 2

( S"pple!entar# designation of categor#

( Stroe

( S"pple!entar# designation of categor#


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SKF ["#$ani%aion]

Other Designations

SKF ["#$ani%aion]

1-04-1! ©SKF Slide ( [Code]

Date Codes


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Date Codes

1-04-1! ©SKF Slide !0 [Code]

SKF ["#$ani%aion]

Letter Year Year Year Year Letter Year Year Year Year

A 1910 1934 1958 1981 N 1922 1946 1970 1993B 1911 1935 1959 1982 O 1923 1947 1971 1994

C 1912 1936 1960 1983 P 1924 1948 1972 1995D 1913 1937 1961 1984 R 1925 1949 1973 1996E 1914 1938 1962 1985 S 1926 1950 1974 1997F 1915 1939 1963 1986 T 1927 1951 1975 1998

G 1916 1940 1964 1987 U 1928 1952 1976 1999E 1917 1941 1965 1988 V 1929 1953 – –J 1918 1942 1966 1989 W 1930 1954 1977 2000

K 1919 1943 1967 1990 X 1931 1955 1978 2001L 1920 1944 1968 1991 Y 1932 1956 1979 2002M 1921 1945 1969 1992 Z 1933 1957 1980 2003

The Year Letter to be marked on a bearing or a bearing accessory shallcomprise a single letter in accordance with the table below


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