Bolt, Nut, Customized Fastener manufacturer / supplier in China, offering Alloy Steel Stud Bolt Full Thread En10204 3.1 B18.31.2 2-1/4 3-3/4 A286 Stud Bolt 660 Thread Rod for Oli&Gas Industry, Factory Direct Sales Oil Power Refinery M90 M45 Unssalt Bath Ferritic Zinc Nickle Plated Black Oxide A193 B7 Stud Bolt for Oil&Gas Industry, B18.2.1 2-5/8 1-1/2 3-3/4 Carbon Steel A193 B7 Hex Bolt for Oil&Gas Industry DIN933 Black ASTM A193 B7 Hex Bolt for Heavy Industry and so on.