Bolt, Nut, CNC Machining Parts manufacturer / supplier in China, offering Copper Nut Customized Hexagon Head Nut Internal Thread for Hardware Fastener/Machine Engineering, Copper Nut Surface Is Passivating Hexagon Head for Furniture/Machine/Hardware Fastener, Hexagon Copper Nut Customized Hardware Nut for Machine/Mechaical Engineering and so on.