Thread Profile Dimensions
| Property | mm | Inch |
|---|---|---|
| Nominal Pipe Size (Ø) | 1/8" | ... |
| Pitch (TPI) (P) | 28 | ... |
| Pitch (Distance) (P) | 0.907 | 0.0357 |
| Thread Tapper Angle (ß) | 1.79° | 1.79° |
| Thread V half Angle (α) | 27.5° | 27.5° |
| Height of sharp V (H) | 0.871 | 0.0343 |
| Thread height (h) | 0.581 | 0.0229 |
| Root/Crest Radius (r) | 0.288 | 0.0113 |
| Major Diameter (At gauge plane) (D) |
9.728 | 0.383 |
| Pitch Diameter (At gauge plane) (D2) |
8.566 | 0.3372 |
| Minor Diameter (At gauge plane) (D1) |
9.147 | 0.3601 |
| BSPT Series | Internal Tapared (Rc) |
| Matching external Thread | BSPT R 1/8 |
| Relevant Standards | ISO 7-1, ISO 7-2 |
BSPT Rc 1/8 - Additional Dimensions
| mm | ||
|---|---|---|
| Gauge Length (Lg) | 4.0 | 0.1575 |
| Lg Tolerance (T2) | 1.25 Turns | 1.25 Turns |
| Lg Tolerance (T2) | 1.1 | 0.0433 |
| Minimum length of useful threads (Lmin) |
4.5 | 0.1772 |
| Tap Drill Size (Td) | 8.4 | 0.3307 |
