Bolts, B8 Stud, Castle Nut manufacturer / supplier in China, offering DIN 933 DIN 931 Hexagon Head Hex Tap Bolt with Hex Nut, ASTM A490 A325 A193 B7/L7/B16 Hot Galvanized Heavy Hex Head Bolt, High Tensile Black Oxide Hex Head Bolts Grade 10.9 DIN931 and so on.