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.
| gauge Code | Form of Thread Inspected | 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° | ||||
| gauge Code | Form of Thread Inspected | 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° | ||||
| 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 |
| IF | ||||
| 5 1/2 IF | V-0.065 | 6.350(4) | 1:6 | 157.201 |
| The angle of form of API gauge: 60° | ||||
