Shaft Hardness

The shaft hardness is important for the contact width of the seal or for any part of the shaft that might contact the sealing lips. If the hardness is so soft that the shaft is susceptible to denting or nicking, then there could be seal damage done during installation. Such materials as bronze, brass and aluminum should not be used without a hardened steel wear sleeve because of excessive wear and grooving.

Parameters Affecting Sealing: