Material: carbon steel, Alloy steel, stainless steel and brass ; Finishing: zinc plated, copper plating, black, phosphating, mechanical galvanized, hot dipped galvanized, dacromet, etc ; Product Line: bolts, nuts, washers, screws, thread rods, steel structures, non-standard parts, metal stamping; Bolt Class: 4.8、5.8、6.8、8.8、10.9、G-2、 G-5 Nut Class: 6、8、10、2H、HV 10、G-2、G-5