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What is a gauge that inspects the minor diameter of a internal thread ?
It is called "Plug Gauge for minor diameter ". It is a standard stock item.
The gauge shape is cylindrical without a screw shape.
This is a set of GO and stop sides to check if the internal thread minor diameter is within the tolerance of the thread standard minor diameter .
It can also be used as a pilot hole inspection gauge for cutting taps.
Conventional JIS Class 2
The stop side represents the inspection set with the notation "IM", and the stop side represents the machine set with the notation "WM".
Current JIS (ISO) 6H
There is no distinction between inspection work on the stop side, and it is represented by the notation GO and the set "PP" on the stop side.
Both are available in M1.4×0.3 ~ M24×1.5.