Chinese Standard: GB/T 20334-2006

Ground thread taps for pipe threads G series and Rp series—Tolerances on the threaded portion

IDT  ISO 5969:1979

全国刀具标准化技术委员会

本标准规定了磨牙丝锥大径及中径的公差以及这些直径的极限尺寸。按这种公差生产的丝锥用于加工按ISO 228-1和ISO 7-1的G系列和Rp系列的管螺纹。
用这些丝锥所加工的内螺纹，习惯上简称为“螺母”。

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