Bolt, Nut, Customized Fastener manufacturer / supplier in China, offering ASTM A320 L43 Stud Bolt Zn-Ni + Xylan 1424 PTFE 2-1/8" to 3-7/8" Nace Mr0175 H2s Scc En10204 3.1 Low Temp Sour Oil Gas, ASTM A320 L71 Stud Bolt, Carbon-Molybdenum Steel, ASME B18.31.2, for Low Temperature Service, ASTM A320 L7m Yellow Zinc Plated Stud Bolt for Low Temperature EPC Oil Gas Project and so on.