NPS Thread Ring Gauge

NPS thread ring gage conform:
FED-STD-H28/7

NPS Thread Ring Gauge
NPSM NPSL NPSH

NPS thread plug gauge

Gauge Code T.P.I pitch(mm) Gauge Code T.P.I pitch(mm)

1/16-27 27 0.941 1-11.5 11.5 2.209

1/8-27 27 0.941 1 1/4-11.5 11.5 2.209

1/4-18 18 1.411 1 1/2-11.5 11.5 2.209

3/8-18 18 1.411 2-11.5 11.5 2.209

1/2-14 14 1.814 . . . . . . . . . . . . . . . . . .

3/4-14 14 1.814 6 8 3.175

Reference:
NPS thread plug gauge

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NPS Thread Ring Gauge

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Gauge Code	T.P.I	pitch(mm)	Gauge Code	T.P.I	pitch(mm)
1/16-27	27	0.941	1-11.5	11.5	2.209
1/8-27	27	0.941	1 1/4-11.5	11.5	2.209
1/4-18	18	1.411	1 1/2-11.5	11.5	2.209
3/8-18	18	1.411	2-11.5	11.5	2.209
1/2-14	14	1.814	. . . . . .	. . . . . .	. . . . . .
3/4-14	14	1.814	6	8	3.175