Posted by on 11/4/2020 to
Charts
NPT pipe thread measurements can get confusing, here's a handy chart to help you fit all your parts together seamlessly.
| Thread Size | Actual OD (Inches) | Threads Per Inch (Pitch) |
|---|---|---|
| 1/16" | 0.3125" | 27 |
| 1/8" | 0.405" | 27 |
| 1/4" | 0.54" | 18 |
| 3/8" | 0.675" | 18 |
| 1/2" | 0.84" | 14 |
| 3/4" | 1.05" | 14 |
| 1" | 1.315" | 11.5 |
| 1 1/4" | 1.66" | 11.5 |
| 1 1/2" | 1.9" | 11.5 |
| 2" | 2.375" | 11.5 |
| 2 1/2" | 2.875" | 8 |
| 3" | 3.5" | 8 |
| 3 1/2" | 4" | 8 |
| 4" | 4.5" | 8 |
| 5" | 5.563" | 8 |
| 6" | 6.625" | 8 |
| 8" | 8.625" | 8 |
| 10" | 10.75" | 8 |
| 12" | 12.75" | 8 |