栓ゲージの使い方 | オーエスジー

Plug gauge is a common name for a plug-shaped cylindrical gauge.

Also known as a plain gauge, it is used to check the accuracy of the hole and the inner diameter and pilot diameter of the internal thread.

Both the street and stop sides are passed, which ensures the accuracy of the hole and the inner diameter.
Accuracy cannot be guaranteed if only one is inspected.
In addition, the plain gauge for holes and the plain gauge for the inner diameter of the internal thread are separate products with different applications.

* The definition of "stop" in the stop side gauge differs depending on the type of gauge. Please refer to the list of how to use each type of plug gauge below.
* The photo is a limit plane gauge. Inner diameter plug gauges are used in a similar way, but the objects to be inspected and the accuracy are different.

List of how to use spigot gauges by type

the gauge symbol

OSG Product Name (Model number)	JIS Type (Thread standard)	Precision Examples:	Machining/Inspection	JIS	How to use
					Stoppage	Street side
Inner Diameter Plug Gauge (LG)	Current JIS （M）	6H, etc.	No distinction	PP	Stop at least one pitch	To pass through without difficulty (penetration)
	Conventional JIS(M)	2nd grade, etc.	handicraft	WM	Don't get through (it's good if you can get through)
			inspection	IM
	Conventional JIS(U)	2B, etc.	handicraft	WM
			inspection	IM
Limit Plane Gauge (PG)	Current JIS	H7, etc.	No distinction	-	Don't go in	Passing through (penetration)