Bolts, B8 Stud, Castle Nut manufacturer / supplier in China, offering Black Oxide Galvanized Double End Stud Bolt (grade 8.8 grade 10.9), Chinese Fastener Manufacturer Bolt Nut Products Hex Weld Nut, Stud Bolt ASTM A453 660 with 2 Heavy Hex Nuts ASME B18.2.1/18.2.2 and so on.