Thread Profile Dimensions
| Property | mm | Inch |
|---|---|---|
| Nominal Pipe Size (Ø) | 1/2" | ... |
| Pitch (TPI) (P) | 14 | ... |
| Pitch (Distance) (P) | 1.814 | 0.0714 |
| Thread V half Angle (α) | 27.5° | 27.5° |
| Height of sharp V (H) | 1.743 | 0.0686 |
| Thread height (h) | 1.162 | 0.0457 |
| Root/Crest Radius (r) | 0.249 | 0.0098 |
| Major Diameter (D) | 20.955 | 0.825 |
| Pitch Diameter (D2) | 19.793 | 0.7793 |
| Minor Diameter (D1) | 18.632 | 0.7335 |
| Tap Drill Size (Td) | 18.5 | 0.7283 |
| Tolerance onD1, D2 & D3 | ±0.142 | ±0.0056 |
| BSPT Series | Internal Parallel (Rp) |
| Matching external Thread | BSPT R 1/2 |
| Relevant Standards | ISO 7-1, ISO 7-2 |
