标准摘要
[中文适用范围]： 规定产品开孔尺寸和位置，推荐使用；列出了从 4 毫米到 52 毫米（含）的螺纹直径的尺寸；给出了产品等级 A、B 和 C 的公差 [外文原描述]： Lays down the dimensions and position of holes for products, recommended for use; tabulates dimensions for thread diameters from 4 mm up to and including 52 mm; gives tolerances for the product grades A, B and C
英文名称Fasteners — Bolts, screws and studs — Split pin holes and wire holes