British Standard Pipe Tapered (BSPT)
Sealing – Sealing is accomplished by distorting the threads. Thread sealant tape is recommended for a leak free connection. A properly chamfered BSPT male will seal with a BSPP Female Swivel.
| Inch Size |
Dash Size |
Nominal Thread |
Male Thread OD (inch) |
Female Thread ID (inch) |
| 1/8 |
-02 |
R1/8×28 |
3/8 (0.38) |
11/32 (0.35) |
| 1/4 |
-04 |
R1/4×19 |
33/64 (0.52) |
15/32 (0.47) |
| 3/8 |
-06 |
R3/8×19 |
21/32 (0.65) |
19/32 (0.60) |
| 1/2 |
-08 |
R1/2×14 |
13/16 (0.82) |
3/4 (0.75) |
| 5/8 |
-10 |
R5/8×14 |
7/8 (0.88) |
13/16 (0.80) |
| 3/4 |
-12 |
R3/4×14 |
1-1/32 (1.04) |
31/32 (0.97) |
| 1 |
-16 |
R1x11 |
1-5/16 (1.30) |
1-7/32 (1.22) |
| 1-1/4 |
-20 |
R1-1/4×11 |
1-21/32 (1.65) |
1-9/16 (1.56) |
| 1-1/2 |
-24 |
R1-1/2×11 |
1-7/8 (1.88) |
1-25/32 (1.79) |
| 2 |
-32 |
R2x11 |
2-11/32 (2.35) |
2-1/4 (2.26) |
