NPT Size
1/2" NPT
The most common general-purpose pipe thread — plumbing, air, and fluid connections.
Last verified: 2026-07-10
| TPIThreads per inch (NPT is tapered at 3/4" per foot). | 14 |
|---|---|
| Pipe OD(in)Actual outside diameter of the thread / pipe. | 0.84 |
| Tap drillTypical tap drill for cutting the internal NPT thread. | 23/32" (0.719") |
| Typical use | General plumbing, air lines, fluid connections |
Other npt pipe thread chart
Sources
- ANSI/ASME B1.20.1 — pipe threads, general purpose (NPT): TPI and pipe OD
- Typical NPT tap-drill charts (machining practice)