Hangzhou Jia Xiang high strength bolt Co., Ltd. Covers an area of 22000 square meters, has the abundant technical force, advanced production equipment, testing equipment is the production of GB, American Standard, Japanese standard steel structure with high strength hex bolt connection deputy, torsion shear type bolt connection pair, cheese head studs for stud welding professional enterprise. Company production equipment, scientific and reasonable process. Bolt selection of high quality alloy steel 35VB, 20MnTiB, nut, gasket selection of 45# high-quality carbon steel, cylindrical head welding ML15AL. Use warm, cold heading bolt upsetting forming process, surface treatment of blackening, Dacromet, hot galvanized, cold galvanizing process. The cylinder head studs adopt cold forging technology, nondestructive hardness testing techniques such as sorting mature and applied to various production processes. Company hired high strength bolt industry senior engineer, has overcome the high strength bolts in hot galvanizing strength is reduced, large size cylinder head welding screws (shear studs) tensile strength, stretching rate unstable a series of technical problems, the quality and stability of the company's products by customers would, customers are widely used in large bridges, power plants, nuclear power, petrochemical, high-rise buildings and other major projects.