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) | 9.0mm | 9.00 |
| 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
M10×1.5 tapping speeds and feeds
Feed = pitch (1.5 mm per rev). Starting points for a general-purpose HSS cut tap:
- Aluminum 6061 / 7075: 680 RPM · 1020 mm/min
- Free-machining / mild steel: 190 RPM · 285 mm/min
- 304 / 316 stainless: 100 RPM · 150 mm/min
M10×1.5 tap speeds and feeds: all materials, form taps and G84 code · 8.5mm drill size and speeds
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.
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