Bolt, Nut, Customized Fastener manufacturer / supplier in China, offering OEM/ODM Pernos Overlength A320 L7 PTFE 2507 Mechanical Serrated API 20e/20f High Strength 12 Point Flange Bolt, ASTM SA-193 Gr. ASME B18.2.1 B8m Stud Bolt with Nuts with PTFE, Heavy Fastener Standard DIN931 DIN933 DIN934 Tap Bolt Hex Head M38 A325 Black Oxide Heavy Hexagon Bolt Heavy Hex Bolt and so on.