Whitworth Pipe Threads
BSPP (G) - British Standard Pipe Parallel and BSPT (R/Rp) – British Standard Tapered Pipe for pipes and tapered threads - G/R/Rp.
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The Whitworth thread specifies a 55° thread angle and a thread depth of 0.640327p and a radius of 0.137329p where p is the pitch.
The most common types of Whitworth pipe threads are
- BSPP (G) – British Standard Pipe Parallel - see ISO 228 Pipe Threads where Pressure-tight Joints are not made on the Threads
- BSPT (R/Rp) – British Standard Tapered Pipe for pipes and tapered threads - see ISO 7 - Pipe Threads where Pressure-tight Joints are made on the Threads
BSPP (G) – British Standard Pipe Parallel
| Thread size (inch) | Major Diameter (mm) | Minor Diameter (mm) | TPI |
|---|---|---|---|
| G 1/16 | 7.723 | 6.561 | 28 |
| G 1/8 | 9.728 | 8.566 | 28 |
| G 1/4 | 13.157 | 11.445 | 19 |
| G 3/8 | 16.662 | 14.950 | 19 |
| G 1/2 | 20.955 | 18.631 | 14 |
| G 3/4 | 26.441 | 24.117 | 14 |
| G 1 | 33.249 | 30.291 | 11 |
| G 2 | 59.614 | 56.656 | 11 |
- TPI = threads per inch
BSPT (R/Rp) – British Standard Tapered Pipe
| Male Thread size (inch) | Female Thread size (inch) | Major Diameter (mm) | Minor Female Diameter (mm) | TPI |
|---|---|---|---|---|
| R 1/16 | Rp 1/16 | 7.723 | 6.490 | 28 |
| R 1/8 | Rp 1/8 | 9.728 | 8.495 | 28 |
| R 1/4 | Rp 1/4 | 13.157 | 11.341 | 19 |
| R 3/8 | Rp 3/8 | 16.662 | 14.846 | 19 |
| R 1/2 | Rp 1/2 | 20.955 | 18.489 | 14 |
| R 3/4 | Rp 3/4 | 26.441 | 23.975 | 14 |
| R 1 | Rp 1 | 33.249 | 30.111 | 11 |
| R 2 | Rp 2 | 59.614 | 56.476 | 11 |
- BSPT male threads seal against threads of fixed BSPT female.
- BSPT male and BSPP male with conical 30° seat seal against matching conical 30° seat of BSPP female swivel.
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