M4×0.7 tap drill size
Use a 3.3mm drill (3.30 mm) for a M4×0.7 cutting tap at 75% thread.
| Tap type | Drill | Decimal (mm) |
|---|---|---|
| Cutting tap, 75% thread | 3.3mm | 3.30 |
| Cutting tap, 50% thread (hard material) | 3.5mm | 3.50 |
| Roll / form tap, 65% thread | 3.70 mm | 3.70 |
| Helicoil / STI insert (M4×0.7×1D) | 4.5mm | 4.50 |
- Pitch
- 0.7 mm
- Major Ø
- 4.00
- Pitch Ø
- 3.54
- Minor Ø
- 3.24
M4×0.7 tapping speeds and feeds
Feed = pitch (0.7 mm per rev). Starting points for a general-purpose HSS cut tap:
- Aluminum 6061 / 7075: 1,700 RPM · 1190 mm/min
- Free-machining / mild steel: 490 RPM · 343 mm/min
- 304 / 316 stainless: 240 RPM · 168 mm/min
M4×0.7 tap speeds and feeds: all materials, form taps and G84 code · 3.3mm drill size and speeds
Common questions
- What size drill for a M4×0.7 tap?
- Use a 3.3mm drill (3.30 mm) for a M4×0.7 cutting tap at 75% thread.
- What drill for a M4×0.7 roll (form) tap?
- About 3.69 mm; the nearest standard drill is 3.70 mm. Check your tap maker's table.
- What drill for a M4×0.7 Helicoil?
- Drill 4.5mm (4.50 mm), then tap with the M4×0.7 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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