used for steel structurer Torshear type high strength bolts for steel structure(TC bolt)Model No.: ... strength: Min:940Mpa5.Surface treatment: Black Oxide, zinc plated, hot dip galvanization, electro galvanization, copper plated, ect.6.Standard: ISO, DIN ... , good reputation, looking forward to cooperation with you. Tor-shear type high strength bolts for steel structure - TC bolt