The full name of steel structure bolts is called steel structure with high-strength large hexagonal head bolt connection pair, which belongs to high-strength bolts. At present, the current national standard is GB/T1228~1231-2006. Steel structure bolts are mainly used in the construction of industrial and civil buildings, railway bridges, highway bridges, pipeline bridges, tower mast structures, boiler frames, boiler steel structures, long-span industrial plants, high-rise civil buildings, various towers, light steel structures, lifting machinery and other steel structure connection buildings.