... components and parts. Need hot through forging4.Automobile flat leaf spring heatinghardening the guide rail of machine tool should meet with ... all kinds of gear wheel, chain wheel, kinds of axis, pin.3. hardening the industrial of machine tool, such as : ... heat treatment pliers, spanner, screwdriver, drill, axe5. hardening pin, piston ring, spring pin, valve, shifting fork.6. all kinds of track spiker ...