Hex Bolt, Hex Nut, Flange Nut manufacturer / supplier in China, offering DIN 6915 Hex Nut High Strength Ss 304 316 Carbon Steel for Steel Structure, DIN 6915 High-Strength Hexagon Nuts with Large Widths Across Flats for Structural Steel Bolting, DIN 1587 Stainless Steel Domed Cup Nuts Hexagon Domed Cup Nuts and so on.