NPT Size
3/4" NPT
Higher-flow plumbing and process connections; common on valves and larger fittings.
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. | 1.05 |
| Tap drillTypical tap drill for cutting the internal NPT thread. | 59/64" (0.922") |
| Typical use | Higher-flow plumbing, valves, process lines |
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)