NPT Thread Ring Gauge

NPT thread ring gage
Gage Code	Pitch(mm)	Gage Code	Pitch(mm)
1/16-27NPT	0.914	1 1/4-11.5NPT	2.209
1/8-27NPT	0.914	1 1/2-11.5NPT	2.209
1/4-18NPT	1.411	2-11.5NPT	2.209
3/8-18NPT	1.411	2 1/2-8NPT	3.175
1/2-14NPT	1.814	3-8NPT	3.175
3/4-14NPT	1.814	. . . . . .	. . . . . .
1-11.5NPT	2.209	6-8NPT	3.175
The taper of NPT thread ring gauge: 1:16.

NPTF thread ring gage
Gage Code	Pitch(mm)	Gage Code	Pitch(mm)
1/16-27NPTF	0.914	1 1/4-11.5NPTF	2.209
1/8-27NPTF	0.914	1 1/2-11.5NPTF	2.209
1/4-18NPTF	1.411	2-11.5NPTF	2.209
3/8-18NPTF	1.411	2 1/2-8NPTF	3.175
1/2-14NPTF	1.814	3-8NPTF	3.175
3/4-14NPTF	1.814	. . . . . .	. . . . . .
1-11.5NPTF	2.209	6-8NPTF	3.175
The taper of NPTF thread ring gauge: 1:16.

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