标准编号：ISO 691:2005
中文名称：螺母和螺栓用成套工具 扳手和套筒扳手的开口 通用公差.
英文名称：Assembly tools for screws and nuts — Wrench and socket openings — Tolerances for general use
发布日期：2005-11
标准范围
This International Standard specifies tolerances on wrench and socket openings for screws and nuts (or similar parts) having metric width across flats dimensions, as shown diagrammatically below.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.
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