... , brass, bronze, copper, gray cast iron, nodular cast iron, engineering plastic (Delrin, Nylon, Teflon, POM), or according to customer request.2 ... machining, stamping machine, EDM, wire cutting machine.3. Finishing:zinc plating, nickle plating, chrome plating, phosphating, polishing, case hardening, carburization hardening, sand blasting, anodizing4 ...