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外径千公尺是目前我国生产现场产泛使用的一种计量器具。按照传统的推荐原则△方≤△允,即测量方法极限误差等于或小于允许的极限误差,1级外径千分尺可检测旧国标3～4级精度的轴类工件,相当于新国标的公差等级1T7～1T9级。按照《检验国际》规定的计量器具选择原则,1级外径千公尺只能用于检测公差等级1T9～1T11(大致相当于旧国标4～5级)的轴类工件,比按传统推荐原则选择的计量器具的可测公
The outer diameter of one thousand meters is currently used in China’s production of a pan-measuring instruments. In accordance with the traditional principle of recommendation △ △ ≤ △ allow, that is, the limit error is equal to or less than the allowable limit error, an outer diameter micrometer can detect the old national standard 3 to 4 precision shaft workpiece, equivalent to the new national standard tolerance class 1T7 ~ 1T9 level. According to the principle of measuring instruments specified in “Testing International”, Class 1 external diameter of one thousand meters can only be used to test shaft workpieces with tolerance class of 1T9 ~ 1T11 (roughly equivalent to old GB 4 ~ 5) than the traditional recommended principles Measuring instruments of choice of measurable public