nhbb :: precision engineering :: recommneded fits and shoulder diameter

tolerances

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 as listed.
D = Bearing OD as listed.
**Bearings must be purchased with bore and OD 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.

Table of Recommended Shoulder Diameter*

Basic Size

Minimum Shaft Shoulder Diameter

Maximum Housing Shoulder Diameter

SSRI-2

SSRI-21/2

SSRI-3

SSRI-4

SSRI-3332

.060

.071

.079

.102

.114

.105

.132

.164

.226

.168

SSRI-5

SSRI-418

SSRI-518

SSRI-618

SSR-2

.122

.148

.153

.179

.284

.226

.284

.347

.325

SSR-2A

SSRI-5532

SSR-1640X

SSRI-5632

SSRI-6632

.179

.180

.210

.216

.446

.288

.580

.288

.347

SSR-3

SSR-1650X

SSR-1950

SSR-1960

SSRI-614

.244

.250

.290

.272

.446

.580

.700

.352

SSRI-814

SSR-4

SSRI-1214

SSR-2270

SSR-2280

.284

.310

.322

.325

.370

.466

.565

.678

.810

SSR-2690

SSRI-8516

SSRI-1038

SSRI-1438

SSRI-2610

.420

.347

.435

.451

.470

.950

.466

.565

.799

.950

SSRI-1212

SSRI-1812

SSRI-1458

SSRI-1634

SSRI-1218

.560

.625

.665

.790

.160

.690

1.025

.835

.960

.710

*Measurement in inches.