Thread Profile Dimensions
| Property | mm | Inch |
|---|---|---|
| Nominal Pipe Size (Ø) | 2 1/2" | ... |
| Pitch (TPI) (P) | 11 | ... |
| Pitch (Distance) (P) | 2.309 | 0.0909 |
| Thread Tapper Angle (ß) | 1.79° | 1.79° |
| Thread V half Angle (α) | 27.5° | 27.5° |
| Height of sharp V (H) | 2.217 | 0.0873 |
| Thread height (h) | 1.479 | 0.0582 |
| Root/Crest Radius (r) | 0.733 | 0.0289 |
| Major Diameter (At gauge plane) (D) |
75.184 | 2.96 |
| Pitch Diameter (At gauge plane) (D2) |
72.227 | 2.8436 |
| Minor Diameter (At gauge plane) (D1) |
73.705 | 2.9018 |
| BSPT Series | Internal Tapared (Rc) |
| Matching external Thread | BSPT R 2 1/2 |
| Relevant Standards | ISO 7-1, ISO 7-2 |
BSPT Rc 2 1/2 - Additional Dimensions
| mm | ||
|---|---|---|
| Gauge Length (Lg) | 17.5 | 0.689 |
| Lg Tolerance (T2) | 1.50 Turns | 1.5 Turns |
| Lg Tolerance (T2) | 3.5 | 0.1378 |
| Minimum length of useful threads (Lmin) |
18.6 | 0.7323 |
| Tap Drill Size (Td) | -999 | -39.3307 |
