Fasteners, Bolt, Screws manufacturer / supplier in China, offering Hex Flange Bolt with Serrated Strength 4.8 to 12.9 Hexagon Flange Bolts, Strength 4.8 to 12.9 Hexagon Flange Bolts Hex Head Flange Bolt, DIN6921 with Serrated Bolts Black Oxide Flange Bolt Hexagon Head Flange Bolt and so on.