Withworth pipe thread DIN EN ISO 228-1
Here you will find the dimensions of the parallel Withworth pipe thread according to DIN EN ISO 228-1 with a flank angle of 55°.
| Nominal Diameter | Pitch | Core Hole Diameter [mm] | TPI (Threads per inch) |
| G1/8" | 0,907 | 8,565 | 28 |
| G1/4" | 1,337 | 11,445 | 19 |
| G3/8" | 1,337 | 14,950 | 19 |
| G1/2" | 1,814 | 18,633 | 14 |
| G5/8" | 1,814 | 20,587 | 14 |
| G3/4" | 1,814 | 24,120 | 14 |
| G1" | 2,309 | 30,292 | 11 |
| G1 1/4" | 2,309 | 38,935 | 11 |
| G1 1/2" | 2,309 | 44,846 | 11 |
| G2" | 2,309 | 56,657 | 11 |
| G2 1/2" | 2,309 | 72,227 | 11 |
| G3" | 2,309 | 84,927 | 11 |
| G3 1/2" | 2,309 | 98,012 | 11 |
| G4" | 2,309 | 110,073 | 11 |
