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.
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.
Related Topics
-
Threads
Thread data - metric, unified, ACME and others.
Related Documents
-
ANSI B1.20.1 - NPT - American National Standard Taper Pipe Threads
NPT and NPTF pipe threads - dimensions according ANSI/ASME B1.20.1/3. -
British Standard Brass Threads
British Brass Thread is an imperial unit based screw thread. -
British Standard Cycle Threads
British Standard Cycle is a British Imperial screw thread standard. -
BS 21 - Pressure Tight Pipe Thread Joints
BSPT - British Standard Pipe Taper threads & BSP or BSPF - British Standard Pipe Parallel (Straight) threads. -
EN 10226 - Pipe Threads where pressure tight joints are made on the threads - Dimensions
Pipe threads where pressure tight joints are made on the threads - Part 1: Taper external threads and parallel internal threads. -
ISO 228 - Pipe Threads where Pressure Tight Joints are not made on the Threads
Requirements for thread form, dimensions, tolerances and designation for fastening pipe threads, thread sizes. -
ISO 7 - Pipe Threads where Pressure-tight Joints are made on the Threads
Pressure-tight joints made on the pipe threads. -
ISO 724 - Metric Threads
Dimensions of metric threads according ISO 724. -
Standards Applied for Piping Threads
Applied threaded standards used for piping connections. -
Threads commonly used in Piping
Piping thread standards. -
UNC and UNF - Unified Inch Screw Threads
ANSI/ASME B1.1 Unified National Thread - UNC Coarse series and UNF Fine series.