M27x3 tap drill size
Use a 24.00 mm drill (24.00 mm) for a M27x3 cutting tap at 75% thread.
| Tap type | Drill | Decimal (mm) |
|---|---|---|
| Cutting tap, 75% thread | 24.00 mm | 24.00 |
| Cutting tap, 50% thread (hard material) | 25.0 mm | 25.00 |
| Roll / form tap, 65% thread | 25.75 mm | 25.75 |
- Pitch
- 3 mm
- Major Ø
- 27.00
- Pitch Ø
- 25.05
- Minor Ø
- 23.75
M27x3 tapping speeds and feeds
Feed = pitch (3 mm per rev). Starting points for a general-purpose HSS cut tap:
- Aluminum 6061 / 7075: 250 RPM · 750 mm/min
- Free-machining / mild steel: 70 RPM · 210 mm/min
- 304 / 316 stainless: 40 RPM · 120 mm/min
M27x3 tap speeds and feeds: all materials, form taps and G84 code
Common questions
- What size drill for a M27x3 tap?
- Use a 24.00 mm drill (24.00 mm) for a M27x3 cutting tap at 75% thread.
- What drill for a M27x3 roll (form) tap?
- About 25.67 mm; the nearest standard drill is 25.75 mm. Check your tap maker's table.
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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