... hardware metal parts, machinery process parts all kinds of gears, chain gears Axles hardening.2. ll kinds of automobile, motorcycle parts ... . such as crank axles, tie rod, gudgeon pin, chain wheel, aluminium wheels, air door, ocher-arm shaft,drive half ... machinery.2. hardening machinery parts, such as: all kinds of gear wheel, chain wheel, kinds of axis, pin.3. hardening the industrial ...