
Unit:mm Unit:mm
| Bar diam | eter | Outside diameter | Bar diam | eter | Outside diameter | ||
| Size | Taper (tip diameter) | Straight | of pipe (for reference) | Size | Taper (tip diameter) | Straight | of pipe (for reference) |
| 1/16-27 NPT | 7.64 | 7.93 | 7.938 | 1/16-27 NPTF | 7.61 | 7.93 | 7.938 |
| 1/8-27 NPT | 9.98 | 10.28 | 10.287 | 1/8-27 NPTF | 9.95 | 10.28 | 10.287 |
| 1/4-18 NPT | 13.25 | 13.71 | 13.716 | 1/4-18 NPTF | 13.20 | 13.71 | 13.716 |
| 3/8-18 NPT | 16.67 | 17.14 | 17.145 | 3/8-18 NPTF | 16.63 | 17.14 | 17.145 |
| 1/2-14 NPT | 20.7 | 21.3 | 21.336 | 1/2-14 NPTF | 20.7 | 21.3 | 21.336 |
| 3/4-14 NPT | 26.0 | 26.6 | 26.670 | 3/4-14 NPTF | 26.0 | 26.6 | 26.670 |
| 1 -11 NPT | 32.5 | 33.3 | 33.401 | 1 -11 NPTF | 32.5 | 33.4 | 33.401 |
| 1 1/4-11 1/2 NPT | 41.3 | 42.1 | 42.164 | 1 1/4-11 1/2 NPTF | 41.3 | 42.1 | 42.164 |
Unit:mm
| Outside diameter | of external thread | Outside diameter | ||
| Size | Max. | Min. | Bar diameter | of pipe (for reference) |
| 1/16-27 NPSM | 7.721 | 7.544 | 7.59 | 7.938 |
| 1/8-27 NPSM | 10.083 | 9.906 | 9.95 | 10.287 |
| 1/4-18 NPSM | 13.360 | 13.132 | 13.19 | 13.716 |
| 3/8-18 NPSM | 16.814 | 16.587 | 16.64 | 17.145 |
| 1/2-14 NPSM | 20.904 | 20.651 | 20.7 | 21.336 |
| 3/4-14 NPSM | 26.263 | 26.010 | 26.1 | 26.670 |
| 1 -11 1/2 NPSM | 32.842 | 32.538 | 32.6 | 33.401 |
| 1 1/4-11 1/2 NPSM | 41.605 | 41.301 | 41.4 | 42.164 |
Technical Inf