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John Guest and DM Straight Adaptors
Stated size versus physical dimensions
To keep you on your toes, the physical dimensions of a fitting are not the same as the stated size. We’ve listed a few below. The sizes quoted are for BSP threads.
| Nominal Size | Major Diameter (mm) | Minor Diameter (mm) |
| 1/4" | 13.157 | 11.445 |
| 3/8” | 16.662 | 14.95 |
| 1/2" | 20.955 | 18.631 |
| 3/4" | 26.441 | 24.117 |
| 1” | 33.249 | 30.291 |
| 1.5” | 47.803 | 44.845 |
