Bolt, Nut, Customized Fastener manufacturer / supplier in China, offering A320 L43 Stud Bolt A194 7 Nut PTFE Xylan Coated Middle East Oil Gas, ASTM A320 L43 Heavy Hex Bolt with A194 Gr. 7 Nut - Blue-White Zinc Plated Low-Temp Alloy Steel Fasteners for Middle East Oil & Gas Projects, ASTM A193 Grade B7 Heavy Hex Bolt - ASTM B633 Zinc Plated (Cr3+) with 3.1 Mtr for ASME B16.5 Flange Bolting and so on.