标准摘要
[中文适用范围]： 本标准规定了公制螺纹丝锥的制造公差要求。 适用于ISO Metric threads of tolerance 4H to SH and 4G to 6G，包括粗牙和细牙螺纹。 主要涉及半角a/2的公差、虚拟螺纹直径误差及相关的测量方法。
英文名称Ground thread taps for ISO metric threads of tolerances 4H to 8H and 4G to 6G coarse and fine pitches — Manufacturing tolerances on the threaded portion — Amendment 1