Our company perennially manufacture torsion shear bolts. Our company perennially supply M12, M16, M20, M22, M24, M27,M30 six threaded specifications which the length is 40mm-220mm and performance level is 10.9(10.9 s). The performance of torsion shear bolts meet the GB/T 3632-2008 standard. Torsion bolts are mainly used for industrial and civil construction, railway bridge, highway bridge, pipeline bridge, tower mast structure, boiler structure, boiler steel frame structure, large-span industrial factory building, high-rise civil buildings, all kinds of tower structure, light steel structure ,steel structure connection construction of hoisting machinery and other construction. Raw materials of torsion shear bolts are purchased from well-known domestic manufacturer of large steel production, which meet the requirements of GB/T 3632-2008 standard ,or which In accordance with buyer's contract material standard of high quality wire rod ,such as XingGang. Raw materials of torsion shear bolts are manufactured by the international advanced professional produced equipment and heated by advanced heat treatment production line . Each production link pass through strictly random by quality inspection department to eliminate the occurrence of unqualified products from the source. So we can ensure you each torsion shear bolts completely accords with the technical specifications of the standard GB/T 3632-2008.