... pitman arm shaft, piston, screw nut assembly, worm and other metal sugar processing, the new product development.Features1.Material: Steel forging ... medium, super audio heating quenching(2)Carburizing and seepage nitrogen, metal seeping(3)Electroplating, nigrescence anti-corrosion, rust4.Advanced equipments: Machining ... grinding machine, caused the milling machine, and so on, Automotive stamping part