Lead Screw, Bolt, Mechanical Anchor Bolt manufacturer / supplier in China, offering Tension Control Bolt for Steel Structure ASTM F3125 F1852 Tc Bolt with Shear Nut Washer, Torsion Shear Bolt 10.9s Twist off Tc Bolt Nut Washer for Steel Structure, High Strength Twist off Tc Bolt 10.9s M12-M30 with Shear Nut Plain Washer for Steel Building Bridge and so on.