Thread Profile Dimensions
| Property | mm | Inch |
|---|---|---|
| Nominal Pipe Size (Ø) | 4" | ... |
| Pitch (TPI) (P) | 11 | ... |
| Pitch (Distance) (P) | 2.309 | 0.0909 |
| Thread V half Angle (α) | 27.5° | 27.5° |
| Height of sharp V (H) | 2.218 | 0.0873 |
| Thread height (h) | 1.479 | 0.0582 |
| Root/Crest Radius (r) | 0.317 | 0.0125 |
| Major Diameter (D) | 113.03 | 4.45 |
| Pitch Diameter (D2) | 111.551 | 4.3918 |
| Minor Diameter (D1) | 110.073 | 4.3336 |
| Tap Drill Size (Td) | -999 | -39.3307 |
| Tolerance onD1, D2 & D3 | ±0.216 | ±0.0085 |
| BSPT Series | Internal Parallel (Rp) |
| Matching external Thread | BSPT R 4 |
| Relevant Standards | ISO 7-1, ISO 7-2 |
