Fastener, Screw, Nut manufacturer / supplier in China, offering C22 Hastelloy Hex Bolt, External Hexagon Head, Grade 8.8, GB Standard 2.4602, Custom Specification, M4-M30 725ln Urea-Grade Steel Hex Nut 1.4466/S31050, DIN934, Fine Thread, Custom Made, a-Grade GB 8.8 High Manganese Steel Expansion Screws for Gypsum Board, Hollow Board and Fiber Cement Board and so on.