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Table of Recommended Fits

The following table includes recommendations for shaft and housing fits for a number of different applications and a table of recommended shoulder diameters for select NHBB part numbers.

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

* For Radial Play .0002 to .0005
♦ Measurement in inches.

L = Loose Fit.
T = Tight Fit.
d = Bearing Bore as listed.
D = Bearing O.D. as listed.
+ Bearings must be purchased with bore and O.D. coding.
Example: To use SSR-2 bearing in a potentiometer, the shaft diameter should be .1250 –.0001 to .1250 –.0003 or .1249 to .1247. The housing should be .3750 +.0002 to .3750 –.0000 or .3752 to .3750.

Recommended Shoulder Diameter*

Basic Size Minimum Shaft Shoulder Diameter Maximum Housing Shoulder Diameter
SSRI-2 .060 .105
SSRI-2 1/2 .071 .132
SSRI-3 .079 .164
SSRI-4 .102 .226
SSRI-3332 .114 .168
SSRI-5 .122 .284
SSRI-418 .148 .226
SSRI-518 .153 .284
SSRI-618 .153 .347
SSR-2 .179 .325
SSR-2A .179 .446
SSRI-5532 .180 .288
SSR-1640X .210 .580
SSRI-5632 .210 .288
SSRI-6632 .216 .347
SSR-3 .244 .446
SSR-1650X .250 .580
SSR-1950 .250 .700
SSR-1960 .290 .700
SSRI-614 .272 .352
SSRI-814 .284 .466
SSR-4 .310 .565
SSRI-1214 .322 .678
SSR-2270 .325 .810
SSR-2280 .370 .810
SSR-2690 .420 .950
SSRI-8516 .347 .466
SSRI-1038 .435 .565
SSRI-1438 .451 .799
SSR-100 .450 .949
SSRI-1212 .560 .690
SSRI-1812 .625 1.025
SSRI-1458 .665 .835
SSRI-1634 .790 .960

* Measurement in inches.