API thread gauge

Sharpfine offers American Petroleum Institute – API gauges. We are able to provide special conical pipe thread gauges for the petroleum industry, designed, manufactured and inspected according to the structural dimensions of the parts.

API gauge conform:
- API spec 5B
- API Spec 7-2

This kind of API GAUGE is a coarse thread mainly used in drill pipes for blasthole ，mining or rock drilling.

API gauges (Number Style)

Gauge Code	Form of Thread	Pitch	Taper	Basic Pitch dia.
NC10	V-0.055	4.233(6)	1:8	27.000
NC12	V-0.055	4.233(6)	1:8	32.131
NC13	V-0.055	4.233(6)	1:8	35.331
NC16	V-0.055	4.233(6)	1:8	40.869
NC23	V-0.038R	6.350(4)	1:6	59.817
NC26 (2 3/8 IF)	V-0.038R (V-0.065)	6.350(4)	1:6	67.767
NC31 (2 3/8 IF)	V-0.038R (V-0.065)	6.350(4)	1:6	80.848
NC35	V-0.038R	6.350(4)	1:6	89.687
NC38 (3 1/2 IF)	V-0.038R (V-0.065)	6.350(4)	1:6	96.723
NC40 (4 FH)	V-0.038R (V-0.065)	6.350(4)	1:6	103.429
NC44	V-0.038R	6.350(4)	1:6	112.192
NC46 (4 IF)	V-0.038R (V-0.065)	6.350(4)	1:6	117.500
NC50 (4 1/2 IF)	V-0.038R (V-0.065)	6.350(4)	1:6	128.059
NC56	V-0.038R	6.350(4)	1:4	142.646
NC61	V-0.038R	6.350(4)	1:4	156.921
NC70	V-0.038R	6.350(4)	1:4	179.146
NC77	V-0.038R	6.350(4)	1:4	196.621

The angle of form of API gauge: 60°

API gauges (Regular Style)

Gauge Code	Form of Thread	Pitch	Taper	Basic Pitch dia.
2 3/8 REG	V-0.040	5.080(5)	1:4	60.080
2 7/8 REG	V-0.040	5.080(5)	1:4	69.605
3 1/2 REG	V-0.040	5.080(5)	1:4	82.293
4 1/2 REG	V-0.040	5.080(5)	1:4	110.868
5 1/2 REG	V-0.050	6.350(4)	1:4	132.944
6 5/8 REG	V-0.050	6.350(4)	1:6	146.248
7 5/8 REG	V-0.050	6.350(4)	1:4	170.549
8 5/8 REG	V-0.050	6.350(4)	1:4	194.731

The angle of form of API gauge: 60°

API gauges (Full-Hole Style)

Gauge Code	Form of Thread Inspected	Pitch	Taper	Basic Pitch dia.
3 1/2 FH	V-0.040	5.080(5)	1:4	94.844
4 1/2 FH	V-0.040	5.080(5)	1:4	115.113
5 1/2 FH	V-0.050	6.350(4)	1:6	142.011
6 5/8 FH	V-0.050	6.350(4)	1:6	165.598
5 1/2 IF	V-0.065	6.350(4)	1:6	157.201

The angle of form of API gauge: 60°

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API gauge

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API thread gauge

API gauges (Number Style)

API gauges (Regular Style)

API gauges (Full-Hole Style)

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