... include automobile redirector pitman arms, pitman arm shafts, pistons, screw nut assemblies, worms and other metal forgings. Besides, we are making ... (2)Carburizing and seepage nitrogen, metal seeping(3)Electroplating, nigrescence anti-corrosion, rust4.Advanced equipments: Machining center, CNC machine, and many ... , grinding machine, caused the milling machine, and so on, Screw nut steering gear