M10×1.5 tap drill size
Use a 8.5mm drill (8.50 mm) for a M10×1.5 cutting tap at 75% thread.
| Tap type | Drill | Decimal (mm) |
|---|---|---|
| Cutting tap, 75% thread | 8.5mm | 8.50 |
| Cutting tap, 50% thread (hard material) | 8.8mm | 8.80 |
| Roll / form tap, 65% thread | 9.35 mm | 9.35 |
| Helicoil / STI insert (M10×1.5×1D) | 10.7mm | 10.70 |
- Pitch
- 1.5 mm
- Major Ø
- 10.00
- Pitch Ø
- 9.03
- Minor Ø
- 8.38
Common questions
- What size drill for a M10×1.5 tap?
- Use a 8.5mm drill (8.50 mm) for a M10×1.5 cutting tap at 75% thread.
- What drill for a M10×1.5 roll (form) tap?
- About 9.34 mm; the nearest standard drill is 9.35 mm. Check your tap maker's table.
- What drill for a M10×1.5 Helicoil?
- Drill 10.7mm (10.70 mm), then tap with the M10×1.5 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.