Ball Bearing Tolerance Charts

Bearing tolerances vary for different applications. Below IBSCO provides bearing tolerance charts including applications, sizes, fits and more.

Table of recommended fits*

Typical Applications Shaft Fit Shaft Diameter Housing Fit Housing Diameter
Tape guide roller, pulley, cam follower, outer ring rotation .0000-.0004L d-.0002
d-.0004
.0001L-.0003T D-.0001
D-.0003
Drive motor (spring preload) .0001T-.0003L d-.0001
d-.0003
.0000-.0004L D+.0002
D-.0000
Precision synchro or servo .0000-.0002L** d-.0001
d-.0003
.0000-.0002L** D+.0001
D-.0001
Potentiometer .0001T-.0003L d-.0001
d-.0003
.0000-.0004L D+.0002
D-.0000
Encoder Spindle .0000-.0002L** d-.0001
d-.0003
.0000-.0002T** D+.0001
D-.0003

*Measurement in inches

L= Loose Fit
T=Tight Fit
d=Bearing bore
D=Bearing OD as listed
**Bearings must be purchased with bore and OD coding

Example: To use SR2 bearing in a potentiometer the shaft diameter should be .1250-.0001 to .1249 to.1247. The housing should be .3750 + .0002 to .3750 + .0000 or .3752 to .3750

Basic Size Minimum Shaft Shoulder Diameter Maximum Housing Shoulder Diameter
SR09 .060 .105
SR0 .071 .132
SR1 .079 .164
SR1-4 .102 .226
SR133 .114 .168
SR1-5 .122 .284
SR144 .148 .226
SR2-5 .153 .284
SR2-6 .153 .347
SR2 .179 .325
SR2A .179 .446
SR155 .180 .288
S634 .210 .580
SR156 .210 .288
SR166 .216 .347
SR3 .244 .446
SR1650 .250 .580
SR1950 .250 .700
SR1960 .290 .700
SR168 .272 .352

Basic Size Minimum Shaft Shoulder Diameter Maximum Housing Shoulder Diameter
SR188 .284 .466
SR4 .310 .565
SR4A .322 .678
SR2270 .325 .810
SR2280 .370 .810
SR2690 .420 .950
SR1810 .347 .466
SR620 .435 .565
SR6 .451 .799
SR2610 .470 .950
SR824 .560 .690
SR8 .625 1.025
SR1028 .665 .835
SR1232 .790 .960
SR1436 .160 .710

*Measurement in inches.

Inner Ring*

Characteristic ABEC 1 ABEC 3P ABEC 5P ABEC 7P ABEC 9P
Bore Tolerance Limits +.0000
-.0003
+.0000
-.0002
+.0000
-.0002
+.0000
-.0002
+.0000
-.00001
Bore 2 pt. out of Roundness     .0001 .0001 .00005
Bore Taper     .0001 .0001 .00005
Radial Runout .0004 .0002(1) .00015 .0001 .00005
Width Variation     .0002 .0001 .00005
Bore Runout with Face     .0003 .0001 .00005
Race Runout with Face     .0003 .0001 .00005

Outer Ring*

Characteristic Configuration Size Range ABEC 1 ABEC 3P ABEC 5P ABEC 7P ABEC 9P
Mean OD Tolerance Limits All 0-18mm +.0000 +.0000 +.0000 +.0000 +.0000
(0-.7086in) -.0003 -.0003 -.0002 -.0002 -.0001
All Over 18-30mm +.0000 +.0000 +.0000 +.0000 +.0000
(.7086-1.1181in) -.0004 -.0003 -.0002 -.0002 -.00015
Maximum OD Tolerance Limits Open 0-18mm +.0001 +.0001 +.0000 +0000 +.0000
(0-.7086in) -.0004 -.0004 -.0002 -.0002 -.0001
Over 18-30mm +.0001 +.0001 +.0000 +.0000 +.0000
(.7086-1.1811in) -.0005 -.0004 -.0002 -.0002 -.00015
Shielded 0-18mm +.0002 +.0002 +.00004 +00004  
(0-.7086in) -.0005 -.0005 -.00024 -.00024  
Over 18-30mm +.0002 +.0002 +.00004 +.00004  
(.7086-1.1811in) -.0006 -.0005 -.00024 -.00024  
OD 2 pt. out of roundness Open 0-18mm     .0001 .0001 .00005
Open Over 18-30mm     .0001 .0001 .00008
Shielded 0-30mm     .0002 .0002  
OD Taper All 0-18mm     .0001 .0001 .0005
All Over 18-30mm     .0001 .0001 .0008
Shielded 0-30mm     .0002 .0002  
Radial Runout All 0-18mm .0006 .0004 .0002 .00015 .00005
All Over 18-30mm .0006 .0004 .0002 .00015 .0001
Width Variation All 0-30mm     .0002 .0001 .00005
OD Runout with Face All 0-30mm     .0003 .00015 .00005
Race Runout with Face Plain 0-18mm     .0003 .0002 .00005
Plain Over 18-30mm     .0003 .0002 .0001
Flanged 0-30mm     .0003 .0003  
Flange Width Tolerance Limits       +.0000 -.0000 +.0000  
      -.0020 -.0020 -.0020  
Flange Diameter Tolerance Limits       +.0050 -.0000 +.0000  
      -.0020 -.0010 -.0010  

Ring Width*

Characteristic Configuration ABEC 1 ABEC 3P ABEC 5P ABEC 7P ABEC 9P
Width Single Bearing +.000 +.000 +.000 +.000 +.000
-.005 -.005 -.001 -.001 -.0041
Duplex Pair     +.000 +.000 +.000
    -.015 -.015 -.015