Nut, Bolt, Screw manufacturer / supplier in China, offering High Strength DIN931 DIN933 DIN960 DIN961 Hex Head Bolts 8.8/12.9 Black Oxide Hexagon Bolts M60 Hex Bolts, Industrial-Grade Heavy-Load Pre-Loaded Adjustable Torque High-Tensile Strength Alloy Steel Hexagon Head Bolts, Exceptional-Strength Deep-Sea Operation Thread Rod and so on.