M12×1.75 tap drill size
Use a 10.2mm drill (10.20 mm) for a M12×1.75 cutting tap at 75% thread.
| Tap type | Drill | Decimal (mm) |
|---|---|---|
| Cutting tap, 75% thread | 10.2mm | 10.20 |
| Cutting tap, 50% thread (hard material) | 10.5mm | 10.50 |
| Roll / form tap, 65% thread | 11.25 mm | 11.25 |
| Helicoil / STI insert (M12×1.75×1D) | 12.8mm | 12.80 |
- Pitch
- 1.75 mm
- Major Ø
- 12.00
- Pitch Ø
- 10.86
- Minor Ø
- 10.11
Common questions
- What size drill for a M12×1.75 tap?
- Use a 10.2mm drill (10.20 mm) for a M12×1.75 cutting tap at 75% thread.
- What drill for a M12×1.75 roll (form) tap?
- About 11.23 mm; the nearest standard drill is 11.25 mm. Check your tap maker's table.
- What drill for a M12×1.75 Helicoil?
- Drill 12.8mm (12.80 mm), then tap with the M12×1.75 STI tap.
Other Metric 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.