Radial Shaft Seal Catalog  
 

SURFACE FINISH

  

 

IMPORTANT CHARACTERISTICS

  • Finish / Roughness

    • Average

    • Peak to Valley

  • Texture / Lay

    • Non-Helical

    • Non-Continuous

  • Hardness

  • No Rough Edges or Sharp Peaks

 

   

The condition of the shaft is as important as the condition of the seal if proper sealing and long life are to be achieved.  Care must be taken to specify the proper design and process parameters for production of the shaft.  Also, adequate care in handling and protection of the sealing surface must be followed, as handling damage to the running surface is one of the most frequent causes of seal leakage.
 

RECOMMENDED SHAFT CONDITION
 
  • Surface roughness 10- 20 minch Ra , Rmax < 126 minch.
  • Shaft hardness minimum 45 Rockwell C
  • No machine lead permitted (plunge grinding recommended)
  • Seal contact area to have no scratches, nicks, or defects and be free of contamination
  • When installing seal over a spline, a protective cover or bullet should be used
  • Seal diameter < Bearing diameter
  • Seal diameter > Spline diameter

 
SHAFT DIA.
(SD)		 CHAMFER
DIA.		 SHAFT DIA.
(SD)		 CHAMFER
DIA.
(INCHES) (INCHES) (mm) (mm)
0.000 to 1.000 SD - 0.094 0.00 to 25.00 SD - 2.4
1.001 to 2.000 SD - 0.140 25.01 to 50.00 SD - 3.6
2.001 to 3.000 SD - 0.166 50.01 to 75.00 SD - 4.2
3.001 to 4.000 SD - 0.196 75.01 to 100.00 SD - 5.0
4.001 to 5.000 SD - 0.220 100.01 to 125.00 SD - 5.6
5.001 to 6.000 SD - 0.260 125.01 to 150.00 SD - 6.6
6.001 to 10.000 SD - 0.276 150.01 to 250.00 SD - 7.0
 
 

PLUNGE GRINDING
 
PLUNGE GRIND PROCESS
  • No Traverse
  • Approx. 80 grit grinding wheel will produce a 10 to 20 micro inch finish
  • Uneven ratio of grinding wheel speed to work piece speed required
  • Must remove entire base finish

ADVANTAGES

  • Short to medium grind marks

- good for lip lubrication

  • Lay is perpendicular to the shaft axis

- no lead angle