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 (ISO 2857:1973 incl. AMD 1:1984 and AMD 2:1986); german version EN 22857:1989
公差为4H至8H和4G至6G粗牙距和细牙距的ISO公制螺纹用磨光丝锥;螺纹部分的制造公差(ISO 2857-1973 包括AMD 1-1984和AMD 2-1986);德文版EN 22857:1989