Bolt, Nut, Thread Rod manufacturer / supplier in China, offering Cup Cylindrical Type Carbon Stainless Steel DIN912 M5 M6 M8 Black Oxide Hexalobular Hexagon Socket Head Allen Bolt Screws Socket Bolt, Grade 12.9 Hexagon Socket Head Screw M3m4m5m6m8m10 High-Strength Bolt Cup Head Screw Cylinder Head Screw Lobe Bolt, ASME B18.2.1 High Strength Square Head Bolt with Square Nut and so on.