M14 x 2 tap drill size
12 mm
- Inches
- 0.4724
- Inch bit
- 15/32"
- Thread
- 77%
Drill a 12 mm hole before cutting an M14 thread with 2 mm pitch. The rule for metric taps is diameter minus pitch.
No metric bits? A 15/32" bit (0.4688 in) gives about 81% thread.
M14 x 2 thread and hole sizes
| Thread | M14, 2 mm pitch, coarse |
|---|---|
| Major diameter | 14 mm 0.5512 in |
| Tap drill | 12 mm 0.4724 in |
| Closest inch bit | 15/32" 0.4688 in |
| Clearance hole, close fit | 15 mm |
| Clearance hole, medium fit | 15.5 mm |
Why 12 mm
Subtract the pitch from the diameter: 14 minus 2 is 12 mm. That leaves 77% thread, the usual target for a cut tap.
More thread than that adds almost no strength and makes the tap much easier to break. In hard or tough material, go 0.1 mm larger.
Tools for this job
- M14 x 2 tap
- 12 mm drill bit
- Tap and drill set
- Drill bit size gauge
- Thread pitch gauge
- Cutting oil for tapping
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