... quality and competitive in price. We have various kinds of nuts,for example,hexagon thin nuts,round nuts,hexagon flange ... galvanized steel, nickel plating, chrome plating, phosphating, polishing, the surface hardening, carburizing and quenching, sand blast, oxidation. 4.Strong engineering team ... . 10. Process flow diagram If you have any design of the metal parts, please inform us, we can make ...