
- for Pipe Threads
- for Pipe Threads
Unit : mm Unit : mmUnit : mm Unit : mm
| Size | Minor Diameter of JIS Max. | internal thread (D1) Min. | Bored hole size ( ref.) |
| PF | 1/16 - 28 | 6.843 | 6.561 | 6.77 |
| PF | 1/8 - 28 | 8.848 | 8.566 | 8.78 |
| PF | 1/4 - 19 | 11.890 | 11.445 | 11.78 |
| PF | 3/8 - 19 | 15.395 | 14.950 | 15.28 |
| PF | 1/2 - 14 | 19.172 | 18.631 | 19.0 |
| PF | 5/8 - 14 | 21.128 | 20.587 | 21.0 |
| PF | 3/4 - 14 | 24.658 | 24.117 | 24.5 |
| PF | 7/8 - 14 | 28.418 | 27.877 | 28.3 |
| PF | 1 - 11 | 30.931 | 30.291 | 30.8 |
| PF | 1 1/8-11 | 35.579 | 34.939 | 35.4 |
| PF | 1 1/4-11 | 39.592 | 38.952 | 39.4 |
| PF | 1 1/2-11 | 45.485 | 44.845 | 45.3 |
| PF | 1 3/4-11 | 51.428 | 50.788 | 51.3 |
| PF | 2 - 11 | 57.296 | 56.656 | 57.1 |
| PF | 2 1/2-11 | 72.866 | 72.226 | 72.7 |
| PF | 3 - 11 | 85.566 | 84.926 | 85.4 |
| PF | 31/2-11 | 98.012 | 97.372 | 97.9 |
| PF | 4 - 11 | 110.712 | 110.072 | 110.6 |
- for American Standard Pipe Thread
| | | | | Unit : mm |
| Size | | Minor diameter o Max. | f internal threads Min. | Bored hole size ( ref.) |
| 1/16- | 27 | NPSC | 6.604 | 6.300 | 6.53 |
| 1/8- | 27 | NPSC | 8.940 | 8.636 | 8.86 |
| 1/4- | 18 | NPSC | 11.633 | 11.227 | 11.53 |
| 3/8- | 18 | NPSC | 15.087 | 14.656 | 14.98 |
| 1/2- | 14 | NPSC | 18.643 | 18.161 | 18.5 |
| 3/4- | 14 | NPSC | 24.003 | 23.495 | 23.9 |
| 1 - | 111/2 | NPSC | 30.073 | 29.490 | 29.9 |
| 11/4- | 111/2 | NPSC | 38.836 | 38.253 | 38.7 |
| 11/2- | 111/2 | NPSC | 44.907 | 44.323 | 44.8 |
| 2 - | 111/2 | NPSC | 56.946 | 56.363 | 56.8 |
| | | Minor diameter of | internal threads | Bored hole size |
| Size | | Max. | Min. | ( ref.) |
| 1/16- | 27 | NPSM | 6.908 | 6.731 | 6.86 |
| 1/8- | 27 | NPSM | 9.245 | 9.094 | 9.21 |
| 1/4- | 18 | NPSM | 12.217 | 11.888 | 12.13 |
| 3/8- | 18 | NPSM | 15.544 | 15.317 | 15.49 |
| 1/2- | 14 | NPSM | 19.278 | 18.974 | 19.2 |
| 3/4- | 14 | NPSM | 24.638 | 24.334 | 24.6 |
| 1 - | 111/2 | NPSM | 30.759 | 30.506 | 30.7 |
| 11/4- | 111/2 | NPSM | 39.497 | 39.269 | 39.4 |
| 11/2- | 111/2 | NPSM | 45.567 | 45.339 | 45.5 |
| 2 - | 111/2 | NPSM | 57.607 | 57.379 | 57.6 |
- for Dryseal American Standard Pipe Thread
| | | | | Unit : mm |
| Size | | Minor diameter o Max. | f internal threads Min. | Bored hole size ( ref.) |
| 1/16- | 27 | NPSF | 6.482 | 6.305 | 6.44 |
| 1/8- | 27 | NPSF | 8.829 | 8.652 | 8.78 |
| 1/4- | 18 | NPSF | 11.455 | 11.232 | 11.40 |
| 3/8- | 18 | NPSF | 14.892 | 14.672 | 14.84 |
| 1/2- | 14 | NPSF | 18.374 | 18.118 | 18.3 |
| 3/4- | 14 | NPSF | 23.721 | 23.465 | 23.7 |
| 1 - | 111/2 | NPSF | 29.758 | 29.464 | 29.7 |
| 11/4- | 111/2 | NPSF | 38.514 | 38.220 | 38.4 |
| 11/2- | 111/2 | NPSF | 44.584 | 44.290 | 44.5 |
| 2 - | 111/2 | NPSF | 56.621 | 56.328 | 56.5 |