Stud Bolt and Nut, Copper Pipe Tube, Spiral Wound Gasket manufacturer / supplier in China, offering Unc ASTM A193 B7m Stud Bolt with 2hm Nut Flange Fastener, Xylan Coated Screws A194 2h Heavy Hexagon Nut A193 B7 Stud Bolt, Colored Zinc A194 2h Hex Nut for Flange and so on.