... motorcycle accessories high-frequency hardening heat treatment. For example: crank shaft, ram, piston pin, camshaft, vavle. transmission within the ... various gears, shifting fork, spline shaft, gear axle, drive axle, small crank shaft pins, rocker, and other accessories ... hydranlic components: for example:the plunger, rotor, reversing shaft in vavle,gear high-frequency hardening machine.all kinds of ...