Stud Bolt and Nut, Copper Pipe Tube, Spiral Wound Gasket manufacturer / supplier in China, offering B16.5 Flange Insulation Gasket Kit for Heat Exchanger, API 20f A453 Gr. 660A Bolting Fastener, 4" A182 F316L B16.5 Stainless Steel Slip on Flange and so on.