Bolt, Nut, Customized Fastener manufacturer / supplier in China, offering ASTM A193 B7 B7m Stud Bolt with ASTM A194 2h 2hm 2 Nuts in Black Oxide, 3/8 Thread Rod En10204 3.1 Nace Mr0175 Stainless Steel A193 B5 Stud Bolt for Oil&Gas Industry, 0.75" Unc ASTM A320 Gr. L7 A320-L7 SA 320 L7m a 194 Gr 7ml Hot Dipped Galvanized Stud Bolt C/W 2 Heavy Hex Nuts & Flat Washer and so on.