BS ISO 965-4:1998
ISO普通米制螺纹.公差.第4部分:与镀锌后公差带位置为H或G攻出的内螺纹相匹配的热浸镀锌外螺纹的尺寸极限
ISO general purpose metric screw threads - Tolerances - 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