used for steel structure projects ASTM A325 TC boltTorsional shear high strength bolt(TC Bolt) ... galvanization, electro galvanization, copper plated, ect.6.Standard: ISO, DIN,BS,GB,ANSL/ASTM, NF, JIS,AS,ect.7.Also can ... do the non standard bolts according to customers' ... price, good reputation, looking forward to cooperation with you. ASTM A325 TC bolt