National Pipe Tapered (NPT)
Sealing – The thread is tapered and the seal takes place by deformation of the threads. Thread sealant tape is recommended for a leak free connection.
| Inch Size |
Dash Size |
Nominal Thread |
Male Thread OD (inch) |
Female Thread ID (inch) |
| 1/8 |
-02 |
1/8×27 |
13/32 (0.41) |
3/8 (0.38) |
| 1/4 |
-04 |
1/4×18 |
17/32 (0.54) |
1/2 (0.49) |
| 3/8 |
-06 |
3/8×18 |
11/16 (0.68) |
5/8 (0.63) |
| 1/2 |
-08 |
1/2×14 |
27/32 (0.84) |
25/32 (0.77) |
| 3/4 |
-12 |
3/4×14 |
1-1/16 (1.05) |
1 (0.98) |
| 1 |
-16 |
1×11-1/2 |
1-5/16 (1.32) |
1-1/4 (1.24) |
| 1-1/4 |
-20 |
1-1/4×11-1/2 |
1-21/32 (1.66) |
1-19/32 (1.58) |
| 1-1/2 |
-24 |
1-1/2×11-1/2 |
1-29/32 (1.90) |
1-13/16 (1.82) |
| 2 |
-32 |
2×11-1/2 |
2-3/8 (2.38) |
2-5/16 (2.30) |
Notifications
