ISO 7413 - 1984 热镀锌1 型(超尺寸攻丝)结构栓接用六角螺母 Hexagon Nuts For Structural Bolting, Style 1, Hot-dip Galvanized(Oversize Tapped)—Product Grades A And B—Property Classes 5,6 And 8
ISO 7417 - 1984 钢结构栓连接用2型热浸镀锌六角螺母 9级 Hexagon Nuts For Structural Bolting—Style 2,Hot-Dip Galvanized(Oversize Tapped)-Product Grade A—Property Class 9