g・pfの通り側ねじゲージにa/bと表記。どんな意味？ | オーエスジー

The notation A/B in the accuracy column of the GO screw gauge of the parallel screws G and PF for pipes means that they can be shared in the pass/fail judgment of the thread accuracy of Class A and Class B.

 

* NOT-GO requires a distinction between Class A and Class B. Please use the accuracy of the drawing instructions.

 

* Please note that it does not mean that there is AB class in addition to A and B grades.