| British Standard
Pipe Threads |
 |
BSP threads are used commonly in many countries outside the U.S.
There are two types of BSP threads: BSPT (British Standard Pipe Taper)
and BSPP (British Standard Pipe Parallel). These two styles are not
interchangeable.
BSPP threads are straight (parallel) threads. They are used where
pressure tight joints are obtained with a sealing ring.
BSPT threads are tapered, and pressure tight joints are achieved by
the threads.
See the tables below for BSPP and BSPT pipe sizes and the corresponding
threads per inch. |
| |
| British Standard Pipe Parallel Threads |
| Parallel Pipe Size |
Thread
Size |
Threads
Per Inch |
| G 1/8" |
3/8" |
28 |
| G 1/4" |
1/2" |
19 |
| G 3/8" |
5/8" |
19 |
| G 1/2" |
3/4" |
14 |
| G 3/4" |
1" |
14 |
| G 1" |
1 3/8" |
11 |
| G 1 1/4" |
1 5/8" |
11 |
| G 1 1/2" |
1 7/8" |
11 |
| G 2" |
2 3/8" |
11 |
| G 2 1/2" |
2 7/8" |
11 |
| G 3" |
3 1/2" |
11 |
|
| |
| British Standard Pipe Tapered Threads |
| Tapered Pipe Size |
Thread
Size |
Threads
Per Inch |
| R 1/8" |
3/8" |
28 |
| R 1/4" |
1/2" |
19 |
| R 3/8" |
5/8" |
19 |
| R 1/2" |
3/4" |
14 |
| R 3/4" |
1" |
14 |
| R 1" |
1 3/8" |
11 |
| R 1 1/4" |
1 5/8" |
11 |
| R 1 1/2" |
1 7/8" |
11 |
| R 2" |
2 3/8" |
11 |
| R 2 1/2" |
2 7/8" |
11 |
| R 3" |
3 1/2" |
11 |
|
| |
|
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