Radial Shaft Seal Catalog  

OPERATING CONDITIONS
 

SEAL WITH SPRING

Design Limitations

SHAFT DIAMETER  NITRILE LIP MAXIMUM CONTINUOUS SHAFT SPEED MAXIMUM CONTINUOUS PRESSURE MAXIMUM TOTAL ECCENTRICITY
General 3,500 rpm 5 psi .020"
.500 7,000 rpm 5 psi .004"
1.500 6,000 rpm 5 psi .006"
2.500 4,000 rpm 5 psi .010"
3.500 3,500 rpm 5 psi .013"
4.500 2,600 rpm 5 psi .017"

NOTE: Higher shaft speeds possible using higher temperature materials such as polyacrylate, fluoroelastomer or silicone.  Slightly higher continuous pressure is possible for shaft speeds below 200 fpm.  Higher eccentricity is allowable if shaft speed is reduced. 

SEAL WITHOUT SPRING

Design Limitations

SHAFT DIAMETER  MAXIMUM SHAFT SPEED MAXIMUM CONTINUOUS PRESSURE MAXIMUM TOTAL ECCENTRICITY
General 2,000 rpm 4 psi .005"
.500 3,500 rpm 4 psi .003"
1.500 2,500 rpm 4 psi .005"
2.500 2,100 rpm 4 psi .006"
3.500 1,500 rpm 4 psi .008"
4.500 1,200 rpm 4 psi .010"

NOTE: Higher eccentricity is allowable if maximum shaft speed is reduced.

A nonsprung seal design offers a cost effective way to seal high viscosity grease applications.  Because the design does not benefit from the constant load of a garter spring, the allowable eccentricity is decreased and the fluids to be sealed are limited.

ECCENTRICITY

Eccentricity is determined by measuring the shaft rounout, TIR and the shaft-to-bore misalignment.  Combine the two results for the total eccentricity the seal lip must follow to function effectively.  As eccentricity increases, and/or shaft speed increases, it becomes more difficult for the lip to follow the shaft.