ISO general purpose metric screw threads -- Tolerances -- Part 5: Limits of sizes for internal screw threads to mate with hot-dip galvanized external screw threads with maximum size of tolerance position h before galvanizing
ISO通用米制螺纹公差第5部分:镀锌前最大公差位置为h的热浸镀锌外螺纹与内螺纹配合的尺寸限制