M30x2 tap drill size
Use a 28.00 mm drill (28.00 mm) for a M30x2 cutting tap at 75% thread.
| Tap type | Drill | Decimal (mm) |
|---|---|---|
| Cutting tap, 75% thread | 28.00 mm | 28.00 |
| Cutting tap, 50% thread (hard material) | 28.75 mm | 28.75 |
| Roll / form tap, 65% thread | 29.0 mm | 29.00 |
- Pitch
- 2 mm
- Major Ø
- 30.00
- Pitch Ø
- 28.70
- Minor Ø
- 27.84
M30x2 tapping speeds and feeds
Feed = pitch (2 mm per rev). Starting points for a general-purpose HSS cut tap:
- Aluminum 6061 / 7075: 230 RPM · 460 mm/min
- Free-machining / mild steel: 60 RPM · 120 mm/min
- 304 / 316 stainless: 30 RPM · 60 mm/min
Common questions
- What size drill for a M30x2 tap?
- Use a 28.00 mm drill (28.00 mm) for a M30x2 cutting tap at 75% thread.
- What drill for a M30x2 roll (form) tap?
- About 29.12 mm; the nearest standard drill is 29.0 mm. Check your tap maker's table.
Other Metric fine 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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