
American Pipe Threads (NPSC) Unit: mm American Pipe Threads (NPSM) Unit: mm
SP
| Size | Minor D Max. | iameter Min. | Drill Size | Recommended Hole Size | |||
| NPSC | 1/16 | - | 27 | 6.604 | 6.300 | 6.50 | 6.53 |
| NPSC | 1/8 | - | 27 | 8.940 | 8.636 | 8.80 | 8.86 |
| NPSC | 1/4 | - | 18 | 11.633 | 11.227 | 11.50 | 11.53 |
| NPSC | 3/8 | - | 18 | 15.087 | 14.656 | 14.90 | 14.98 |
| NPSC | 1/2 | - | 14 | 18.643 | 18.161 | 18.50 | 18.52 |
| NPSC | 3/4 | - | 14 | 24.003 | 23.495 | 23.75 | 23.88 |
| NPSC | 1 | - | 11.5 | 30.073 | 29.490 | 29.80 | 29.93 |
| NPSC | 1 1/4 | - | 11.5 | 38.836 | 38.253 | 38.50 | 38.69 |
| NPSC | 1 1/2 | - | 11.5 | 44.907 | 44.323 | 44.75 | 44.76 |
| NPSC | 2 | - | 11.5 | 56.946 | 56.363 | 56.75 | 56.80 |
| Size | Minor D Max. | iameter Min. | Drill Size | Recommended Hole Size | |||
| NPSM | 1/16 | - | 27 | 6.898 | 6.747 | 6.80 | 6.86 |
| NPSM | 1/8 | - | 27 | 9.246 | 9.094 | 9.20 | 9.21 |
| NPSM | 1/4 | - | 18 | 12.217 | 11.888 | 12.10 | 12.13 |
| NPSM | 3/8 | - | 18 | 15.554 | 15.317 | 15.50 | 15.49 |
| NPSM | 1/2 | - | 14 | 19.278 | 18.974 | 19.20 | 19.20 |
| NPSM | 3/4 | - | 14 | 24.638 | 24.334 | 24.50 | 24.60 |
| NPSM | 1 | - | 11.5 | 30.759 | 30.506 | 30.60 | 30.70 |
| NPSM | 1 1/4 | - | 11.5 | 39.497 | 39.269 | 39.40 | 39.40 |
| NPSM | 1 1/2 | - | 11.5 | 45.567 | 45.339 | 45.50 | 45.50 |
| NPSM | 2 | - | 11.5 | 57.607 | 57.379 | 57.50 | 57.60 |
ST NPSC 2 - 11.5 56.946 56.363 56.75 56.80 NPSM 2 - 11.5 57.607 57.379 57.50 57.60
Dryseal American Pipe Threads (NPSF) Unit: mm
| Size | Minor D Max. | iameter Min. | Drill Size | Recommended Hole Size | |||
| NPSF | 1/16 | - | 27 | 6.482 | 6.305 | 6.40 | 6.44 |
| NPSF | 1/8 | - | 27 | 8.740 | 8.652 | 8.70 | 8.72 |
| NPSF | 1/4 | - | 18 | 11.363 | 11.232 | 11.30 | 11.33 |
| NPSF | 3/8 | - | 18 | 14.803 | 14.672 | 14.75 | 14.77 |
| NPSF | 1/2 | - | 14 | 18.288 | 18.118 | 18.25 | 18.20 |
| NPSF | 3/4 | - | 14 | 23.634 | 23.465 | 23.50 | 23.50 |
| NPSF | 1 | - | 11.5 | 29.669 | 29.464 | 29.50 | 29.60 |
| NPSF | 1 1/4 | - | 11.5 | 38.514 | 38.220 | 38.30 | 38.40 |
| NPSF | 1 1/2 | - | 11.5 | 44.584 | 44.290 | 44.50 | 44.50 |
| NPSF | 2 | - | 11.5 | 56.621 | 56.328 | 56.50 | 56.50 |
TAPS NPSF 2 - 11.5 56.621 56.328 56.50 56.50
THREADS,