Screw, Bolts, Nuts manufacturer / supplier in China, offering High Strength 4.8 8.8 12.9 Hex Bolt High Strength Hex Bolt and Nuts Fasteners Factory Custom ASME DIN Supplier, Directly Factory High Quality Grade 8.8 Carbol Steel Black Stud, China Manufacturer A2 A4 304 316 Stainless Steel Hexagon Bolts with Split Pin Hole on Shank M3 M4 M5 M6 M8 10m M12 M14 M16 M20 M24 M27 Bolt and Nut and so on.