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Tapered threaded plug gauges for pipes have a difference in the number of notches.

R is 2 stages, PT is 1 stage.

[Difference in tapered thread gauge for pipes < plug >]

Gauge Symbols	TG	TG
kind	PT	R
standard	Conventional JIS	ISO
Screw to measure	PT & PS	RC/Rp
use	If the pipe end is within the notch range of the gauge, it will pass.
Passing range
Number of notches	1	2
other	Rc and Rp gauges are indicated as "R" ・ No street/stop setting ・No distinction between machine use and inspection - No precision

Tapered threaded ring gauges for pipes do not differ in the number of notches like plug gauges.

However, the thickness of the gauge itself is thicker for PT than for R.

R is because the reference diameter position is set on the gauge end face, and PT is because the reference diameter position is inside the gauge.

[Difference between tapered thread gauges for pipes ]

Gauge Symbols	TG	TG
kind	PT	R
standard	Conventional JIS	ISO
Screw to measure	PT	R
use	If the pipe end is within the notch range of the gauge, it will pass.
Reference Diameter Position
Passing range
other	There is no difference in the number of notches. There is a difference in the thickness of the gauge ・No distinction between machine use and inspection - No precision

Tapered screws for pipes do not have the same distinction as parallel screws due to thread accuracy. There is only one.

Since the shape and tolerance are different, both the plug gauge and the ring gauge cannot be shared.

Use the thread type gauge in the drawing instructions.