Thread dimensions
Process connection and cable entry threads with their standard dimensions and sealing method.
| Thread | Standard | Form | Major Ø (mm) | TPI | Pitch (mm) | Flank |
|---|---|---|---|---|---|---|
| G 1/8 | ISO 228-1 (BSPP) | Parallel | 9.728 | 28 | 0.907 | 55° |
| G 1/4 | ISO 228-1 (BSPP) | Parallel | 13.157 | 19 | 1.337 | 55° |
| G 3/8 | ISO 228-1 (BSPP) | Parallel | 16.662 | 19 | 1.337 | 55° |
| G 1/2 | ISO 228-1 (BSPP) | Parallel | 20.955 | 14 | 1.814 | 55° |
| G 3/4 | ISO 228-1 (BSPP) | Parallel | 26.441 | 14 | 1.814 | 55° |
| G 1 | ISO 228-1 (BSPP) | Parallel | 33.249 | 11 | 2.309 | 55° |
| R 1/4 | ISO 7-1 (BSPT) | Taper 1:16 | 13.157 | 19 | 1.337 | 55° |
| R 1/2 | ISO 7-1 (BSPT) | Taper 1:16 | 20.955 | 14 | 1.814 | 55° |
| 1/8 NPT | ASME B1.20.1 | Taper 1:16 | 10.287 | 27 | 0.941 | 60° |
| 1/4 NPT | ASME B1.20.1 | Taper 1:16 | 13.716 | 18 | 1.411 | 60° |
| 3/8 NPT | ASME B1.20.1 | Taper 1:16 | 17.145 | 18 | 1.411 | 60° |
| 1/2 NPT | ASME B1.20.1 | Taper 1:16 | 21.336 | 14 | 1.814 | 60° |
| 3/4 NPT | ASME B1.20.1 | Taper 1:16 | 26.670 | 14 | 1.814 | 60° |
| 1 NPT | ASME B1.20.1 | Taper 1:16 | 33.401 | 11.5 | 2.209 | 60° |
| M12×1.5 | ISO 261 | Parallel | 12.000 | — | 1.500 | 60° |
| M14×1.5 | ISO 261 | Parallel | 14.000 | — | 1.500 | 60° |
| M16×1.5 | ISO 261 | Parallel | 16.000 | — | 1.500 | 60° |
| M20×1.5 | ISO 261 | Parallel | 20.000 | — | 1.500 | 60° |
| M25×1.5 | ISO 261 | Parallel | 25.000 | — | 1.500 | 60° |
| 7/16-20 UNF | SAE J1926 (-4) | Parallel | 11.112 | 20 | 1.270 | 60° |
| 9/16-18 UNF | SAE J1926 (-6) | Parallel | 14.288 | 18 | 1.411 | 60° |
| PG 9 | DIN 40430 | Parallel | 15.200 | 18 | 1.410 | 80° |
| PG 11 | DIN 40430 | Parallel | 18.600 | 18 | 1.410 | 80° |
| PG 13.5 | DIN 40430 | Parallel | 20.400 | 18 | 1.410 | 80° |
| PG 16 | DIN 40430 | Parallel | 22.500 | 18 | 1.410 | 80° |