Chinese Standard: GB/T 4390-2008

Wrench openings—Tolerances for general use

MOD  ISO 691:2005

全国五金制品标准化技术委员会工具五金分技术委员会

本标准规定了图1所示的公制扳手开口和扳手孔的常用公差。
本标准适用于扳拧对边尺寸为公制的螺栓、螺钉和螺母（或类似零件）的呆扳手和梅花扳手。

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