British Standard Pipe Tapered (BSPT)
The tapered male connects with a tapered female, with the seal forming in the threads.
Note: Although the BSPT male end is comparable to the National Pipe Tapered Fuel (NPTF), they are not interchangeable, due to their different size and thread form.
Inch size | Dash size | Thread Size | Male Thread O.D. (in) | Female thread O.D (in) | ||
1⁄8 | -2 | 1⁄8 - 28 | 3⁄8 | 0.38 | 11⁄32 | 0.35 |
1⁄4 | -4 | 1⁄4 - 19 | 33⁄64 | 0.52 | 15⁄32 | 0.47 |
3⁄8 | -6 | 3⁄8 - 19 | 21⁄32 | 0.65 | 19⁄32 | 0.60 |
1⁄2 | -8 | 1⁄2 - 14 | 13⁄16 | 0.82 | 3⁄4 | 0.75 |
5⁄8 | -10 | 5⁄8 - 14 | 7⁄8 | 0.88 | 13⁄16 | 0.80 |
3⁄4 | -12 | 3⁄4 - 14 | 1 1⁄32 | 1.04 | 31⁄32 | 0.97 |
1 | -16 | 1 - 11 | 1 5⁄16 | 1.30 | 1 7⁄32 | 1.22 |
1 1⁄4 | -20 | 1 1⁄4 - 11 | 1 21⁄32 | 1.65 | 1 9⁄16 | 1.56 |
1 1⁄2 | -24 | 1 1⁄2 - 11 | 1 7⁄8 | 1.88 | 1 25⁄32 | 1.79 |
2 | -32 | 2 - 11 | 2 11⁄32 | 2.35 | 2 1⁄4 | 2.26 |
