ISO 965-4:2021
ISO通用公制螺纹-公差-第4部分:镀锌后与公差位置为H或G的内螺纹配合的热镀锌外螺纹的尺寸限制
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