Modified Stock Gearing - Boston Gear

Engineering Information
Press Fit Allowances
The allowance for press fit into a housing will vary depending
upon bearing size, wall thickness, housing material, and
housing construction. The accompanying graphs will be a
useful guide in determining allowances for press fits.
PRESS FIT IN INCHES
Plastics
.005
.004
.003
.002
.001
BEAR-N-BRONZ
MAXIMUM
MINIMUM
.000
0 .5 1.0 1.5 2.0 2.5 3.0 3.5
HOUSING DIAMETER IN INCHES
4.0 4.5 5.0
Due to normal variations in molded bearings, practicality
dictates the measuring of actual bearing O.D. and adjusting
bore size accordingly.
For this reason, the minimum required press fit depicted in
graph, for F-1 material and other plastic material is
approximate and may be used as a guide.
.010
.009
.008
BOST-BRONZ
When a BOST-BRONZ bearing is pressed into a housing, the
inside diameter (I.D.) will close-in (becoming smaller). The
amount will depend upon the same factors influencing the
Press Fit, but will average approximately 75% of the Press Fit
allowance.
PRESS FIT IN INCHES
.007
.006
.005
.004
.003
.002
.001
MAX. FOR SOFT METAL HOUSING
MAX. IRON OR STEEL HOUSING
MINIMUM
.000
0 .5 1.0 1.5 2.0 2.5 3.0
HOUSING DIAMETER IN INCHES
3.5
F
PRESS FIT IN INCHES
.007
.006
.005
.004
.003
.002
.001
MINIMUM
MINIMUM F-1 ONLY
.000
0 .5 1.0 1.5 2.0 2.5 3.0
HOUSING DIAMETER IN INCHES
3.5
P-1930-BG 04/10 Boston Gear 800-825-6544 181