Bolt, Nut, CNC Machining Parts manufacturer / supplier in China, offering DIN6923 Stainless Steel 304 Serrated Hex Socket Large Flange Nuts, Hex Socket Flange Nut with Serrated Anti-Loosening M5 M6 M8 M10 M12, Customized Hex Socket Big Flange Nut Carbon Steel/Stainless Steel for Auto & Construction and so on.