栓ゲージとは？何を検査するゲージ？

What is a Stopper Gauge? What gauge to inspect?

Plug gauge is a common name for a cylindrical gauge without a plug-shaped thread.

There are "limit plane gauges" and "inner diameter plug gauges".

Both inspect hole-shaped objects and have similar gauge appearances, but differ in the object to be inspected and the accuracy.

A limit plane gauge is used to check whether the hole diameter meets the tolerance dimensions of the hole specified in the drawing. （JIS B 7420）
Example: Φ12 H7

The inner diameter plug gauge inspects whether the inner diameter of the internal thread is within the tolerances specified for each thread accuracy. （JIS B 0251）
Example: M6×1 6H

What to inspect	OSG Name	OSG Model No.	Information required for selection
hole	Limit Plane Gauge	PG	* (1) Hole call *(2) Hole accuracy Example of description Φ10※① H7※②
Inner diameter of the screw Screw pilot hole	Inner Diameter Plug Gauge	LG	* (1) Screw call (2) Thread accuracy (3) For inspection and construction (in the case of conventional JIS) Example of description M10×1.5(1) Grade 2(2) Inspection*(3)

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栓ゲージとは？何を検査するゲージ？ | オーエスジー

What is a Stopper Gauge? What gauge to inspect?