... crossing bolts, high tensile strength bolts for rail bridges etc.3, Various type and sizes of tie plates, clamps, fastenings ... according to the international standards including ANSI, ASTM (America), DIN (Germany), GB (China), UNI, JIS (Japan), ISO and TCVN (Vietnam). ... Description(TC bolt) Torshear type high strength bolts for steel structureMaterialAlloy steel ,carbon steel, stainless steel etc ...