... motorcycle accessories high-frequency hardening heat treatment. For example: crank shaft, ram, piston pin, camshaft, vavle. transmission within ... fork, spline shaft, gear axle, drive axle, small crank shaft pins, rocker, and other accessories high frequency hardening ... high-frequency hardening heat treatment, for example: vice, locking pliers, spanner.hydranlic components: for example:the plunger, ...