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 |
| Minor Diameter (At gauge plane) (d1) |
38.953 | 1.5336 |
| Pitch Diameter (At gauge plane) (d2) |
40.431 | 1.5918 |
| BSPT Series | External Tapared (R) |
| Matching Internal Tapered Thread | BSPT Rc 1 1/4 |
| Matching Internal Parallel Thread | BSPT Rp 1 1/4 |
| Relevant Standards | ISO 7-1, ISO 7-2 |
BSPT R 1 1/4 - Additional Dimensions
| mm | ||
|---|---|---|
| Gauge Length (Lg) | 12.7 | 0.5 |
| Lg Tolerance (T1) | 1 Turns | 1 Turns |
| Lg Tolerance (T1) | 2.3 | 0.0906 |
| Fitting allowance (F) | 2.75 Turns | 2.75 Turns |
| Fitting allowance (F) | 6.4 | 0.252 |
| Minimum length of useful threads (Lmin) |
16.8 | 0.6614 |
