1/2 NPT tap drill size
23/32"
- Inches
- 0.7188
- Millimetres
- 18.26
- Threads per inch
- 14
Drill a 23/32" hole, then cut the 1/2 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.
1/2 NPT thread and hole sizes
| Thread | 1/2 NPT National Pipe Taper, 14 threads per inch |
|---|---|
| Tap drill, no reamer | 23/32" 0.7188 in, 18.26 mm |
| Pitch | 0.0714 in 1.814 mm |
Tools for this job
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