Since the V-seal mounts in the shaft instead of running against it, there are no stringent requirements for shaft finish or hardness. The shaft can be soft metal or even plastic. It can be rough or have tool marks without and effect on the seal. Also, since the sealing pressure of the V-seal is so light, the counterface surface on which the seal rides does not require a fine finish.
The recommended finish for the counterfaceis 32-63 microinch rms. The seal can even run on a finish as rough as 125 rms, if the surface is buffed with emery cloth to remove any sharp edges. The hardness of the counterface can be soft as 32 RC, and can be of any type of metal. Plastics are generally not recommended.
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