标准摘要
[中文适用范围]： 本国际标准规定了具有公制双面宽度尺寸的螺钉和螺母（或类似零件）的扳手和套筒开口的公差，如下图所示。 它给出了每个尺寸的通用公差，由相对于标称值的两个偏差（最小和最大）定义。 这些偏差是根据 ISO 4759-1 中规定的螺钉和螺母的对边宽度公差以及紧固工具的制造来确定的。 [外文原描述]： ISO 691:2005 specifies tolerances on wrench and socket openings for screws and nuts (or similar parts) having metric width across flats dimensions. It gives, for each dimension, the tolerances for general use, defined by its two deviations, minimum and maximum, with respect to the nominal value. These deviations have been determined in relation to the width across flats tolerances for screws and nuts specified in ISO 4759-1 and with regard to the manufacture of tightening tools.
英文名称Assembly tools for screws and nuts — Wrench and socket openings — Tolerances for general use