Thread Profile Dimensions
| Property | mm | Inch |
|---|---|---|
| Nominal Pipe Size (Ø) | 1 1/4" | ... |
| 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) |
41.91 | 1.65 |
| Pitch Diameter (At gauge plane) (D2) |
38.953 | 1.5336 |
| Minor Diameter (At gauge plane) (D1) |
40.431 | 1.5918 |
| BSPT Series | Internal Tapared (Rc) |
| Matching external Thread | BSPT R 1 1/4 |
| Relevant Standards | ISO 7-1, ISO 7-2 |
BSPT Rc 1 1/4 - Additional Dimensions
| mm | ||
|---|---|---|
| Gauge Length (Lg) | 12.7 | 0.5 |
| Lg Tolerance (T2) | 1.25 Turns | 1.25 Turns |
| Lg Tolerance (T2) | 2.9 | 0.1142 |
| Minimum length of useful threads (Lmin) |
13.4 | 0.5276 |
| Tap Drill Size (Td) | 38.5 | 1.5157 |
