M42x3 tap drill size
Use a 39.00 mm drill (39.00 mm) for a M42x3 cutting tap at 75% thread.
| Tap type | Drill | Decimal (mm) |
|---|---|---|
| Cutting tap, 75% thread | 39.00 mm | 39.00 |
| Cutting tap, 50% thread (hard material) | 40.0 mm | 40.00 |
| Roll / form tap, 65% thread | 40.5 mm | 40.50 |
- Pitch
- 3 mm
- Major Ø
- 42.00
- Pitch Ø
- 40.05
- Minor Ø
- 38.75
Common questions
- What size drill for a M42x3 tap?
- Use a 39.00 mm drill (39.00 mm) for a M42x3 cutting tap at 75% thread.
- What drill for a M42x3 roll (form) tap?
- About 40.67 mm; the nearest standard drill is 40.5 mm. Check your tap maker's table.
Other Metric fine sizes
Drill sizes from Machinery's Handbook and ASME B1.1/B1.13M; roll tap sizes from the form-tap formula. Tap and insert makers' tables are authoritative.
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