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EPM, Inc.
112 W Burke St.
Stockbridge, GA 30281
800-659-5050
sales@epm.com

Phones and Fax Numbers

Call Free in the US: 800.659.5050
Local & International: 770.389.0501
Fax U.S: 888.353.7325
Fax Local & International: 770.389.0652
Housing Recommendation 2016-12-29T09:16:30+00:00
HOUSING RECOMMENDATION

Which type of oil seal, either covered seal or metal O.D. seal, is recommended depends upon the material of housing. The following are our recommendations.:
Housing material fit for metal cased seals – steel and cast iron.

When applied to housing material of high thermal expansion, such as aluminum or other soft alloys, at temperature raising condition, metal cased seals occasionally back out of the bore due to expansion clearness. On the other hand, if we use rubber covered seals instead of metal cased ones, the clearness will vanish because of the higher thermal expansion rate of rubber itself.

BORE CHAMFER

To assist in installation of seals, a bore chamfer is necessary. If the bore chamfer is improper or not existing, it will distort the seal case and require more assembly force.

SURFACE ROUGHNESS

Excessively rough bore finishes may allow paths for fluid to leak between seal O.D. and bore. Following is recommended maximum roughness.

Table EPM-1 Housing Bore Roughness
.

Metal O.D.

Rubber O.D.
Maximum

100 µ inch AA

150 µ inch AA
Roughness

2.50 µ M AA

3.75 µ M AA

*The rubber covered seal is capable of functioning with a rougher surface of housing.

oil_dia1
Figure EPM-1 Recommended Bore Lead Corner
TOLERANCE FOR INSTALLATION

SHAFT TOLERANCE
The tolerance range should be decreased for high speed or pressure applications.

Table EPM-2 Recommended Shaft Tolerance

Diameter Inch

Tolerance

Diameter Metric

Tolerance

Up to 4.000″

± 0.03

Up to 100 mm

± 0.08

4.001″ to 6.000″

± 0.04

100.10 to 150.00

± 0.10

6.001″ to 10.000″

± 0.05

150.10 to 250.00

± 0.13