3/4 NPT tap drill size
59/64"
- Inches
- 0.9219
- Millimetres
- 23.42
- Threads per inch
- 14
Drill a 59/64" hole, then cut the 3/4 NPT thread with a taper pipe tap. This is the size for drilling and tapping with no reamer step.
Charts differ on pipe threads. Some list a smaller drill because they assume the hole is taper-reamed first. If you ream, use the drill size your tap or reamer maker lists.
3/4 NPT thread and hole sizes
| Thread | 3/4 NPT National Pipe Taper, 14 threads per inch |
|---|---|
| Tap drill, no reamer | 59/64" 0.9219 in, 23.42 mm |
| Pitch | 0.0714 in 1.814 mm |
Tools for this job
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