Stud Bolt and Nut, Copper Pipe Tube, Spiral Wound Gasket manufacturer / supplier in China, offering 2507 Stud Bolt for Oil and Gas Industry, Inconel 601 Bolts with Excellent Oxidation Resistance at High Temperatures, Aorrosion Resistant Alloy 20 Bolt for Hydrometallurgy and Sulfuric Acid Industry and so on.