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

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Call Free in the US: 800.659.5050
Local & International: 770.389.0501
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Shaft Recommendation 2016-12-29T09:16:30+00:00

Shaft Recommendation

Four main conditions make the seal and shaft more compatible and assist in providing optimal seal performance.

1. SHAFT HARDNESS
Normally seal contact area of the shaft should be Rockwell C 45 minimum. It is and important factor to prevent excessive wear, deformation, scratches or nicks, and to control the roughness or machining surface easily.

2. SHAFT SURFACE ROUGHNESS
The recommended shaft surface roughness is as follows:
Rotating: 10 to 20 µ inch AA (.25 µm to .50 µm AA).
Reciprocating: 5 to 10 µ inch AA (.13 µm to .25 µm AA).
This is very critical as greatly influence the amount of lip heat, thus this finish not be overlooked.

3. GRINDING
Rotating Shift: plunge grinding is recommended.
Reciprocating shaft: centerless grinding is acceptable.
Cast iron or stainless steel shafts for rotating applications and steel shafts for reciprocating applications, we suggest using hard chrome plating. The finishing surfaces described above are required to have no machine lead, otherwise it may actually pump fluid from wider the seal lip.

4. SHAFT CHAMFER
Without proper chamfer on shaft, the seal lip may be damaged or distorted resulting in dislodged garter spring. We suggest chamfer as Table EPM-3 to assist in the installations process.

oil_dia2

Table EPM-3

INCHES

MILLIMETERS

S.D.

D1

S.D.

D1

S.D.

D1

S.D.

D1

Up to 1.000

S.D.-.094

4.001 to 5.000

S.D.-.220

Up to 25.00

S.D.-2.4

100.01 to 125.00

S.D.-5.6

1.001 to 2.000

S.D.-.140

5.001 to 6.000

S.D.-.260

25.01 to 50.00

S.D.-3.6

125.01 to 150.00

S.D.-6.6

2.001 to 3.000

S.D.-.166

6.001 to 10.000

S.D.-.276

50.01 to 75.00

S.D.-4.2

150.01 to 250.00

S.D.-7.0
3.001 to 4.000

S.D.-.196


75.01 to 100.00

S.D.-5.0