NF E03-055:2004
ISO一般用途米制螺纹.公差.第4部分:热浸镀锌外螺纹的极限尺寸、与其相配的内螺纹镀锌后攻丝、内螺纹的公差带位置为H或G
ISO general purpose metric screw threads - Tolerances - Part 4 : limits of sizes for hot-dip galvanized external screw threads to mate with internal screw threads tapped with tolerance position H or G after galvanizing.