Stud Bolt and Nut, Copper Pipe Tube, Spiral Wound Gasket manufacturer / supplier in China, offering Nitrogenous Nickel-Chromium-Molybdenum Alloy31 Bolt for Chemistry and Petrochemicals, Aorrosion Resistant Alloy28 Hex Head Bolt for Chemical and Aetrochemical Processing Industries, Aorrosion Resistant Alloy 28 Stud Bolt for Chemical and Aetrochemical Processing Industries and so on.