Thread Size Chart For NPT Fuel Line Fittings
Posted by Filler Neck Supply Co on May 1st 2019
Here Is A Chart That Shows All of the Pipe thread Sizes and Threads Per inch Tpi: NPT Fittings (Click Here)
| Pipe Thread Size: | Threads Per Inch: | Theoretical I.D. | Closest AN Size: |
| 1/16 | 27 | 1/16 | - |
| 1/8 | 27 | 1/8 | 4 |
| 1/4 | 18 | 1/4 | 6 |
| 3/8 | 18 | 3/8 | 8 |
| 1/2 | 14 | 1/2 | 10 |
| 3/4 | 14 | 3/4 | 12 |
| 1 | 11-1/2 | 1 | 16 |
| 1-1/4 | 11-1/2 | 1-1/4 | 20 |
| 1-1/2 | 11-1/2 | 1-1/2 | 24 |
| 2 | 11-1/2 | 2 | 32 |