M39x3 tap drill size
Use a 36.00 mm drill (36.00 mm) for a M39x3 cutting tap at 75% thread.
| Tap type | Drill | Decimal (mm) |
|---|---|---|
| Cutting tap, 75% thread | 36.00 mm | 36.00 |
| Cutting tap, 50% thread (hard material) | 37.0 mm | 37.00 |
| Roll / form tap, 65% thread | 37.5 mm | 37.50 |
- Pitch
- 3 mm
- Major Ø
- 39.00
- Pitch Ø
- 37.05
- Minor Ø
- 35.75
M39x3 tapping speeds and feeds
Feed = pitch (3 mm per rev). Starting points for a general-purpose HSS cut tap:
- Aluminum 6061 / 7075: 170 RPM · 510 mm/min
- Free-machining / mild steel: 50 RPM · 150 mm/min
- 304 / 316 stainless: 20 RPM · 60 mm/min
Common questions
- What size drill for a M39x3 tap?
- Use a 36.00 mm drill (36.00 mm) for a M39x3 cutting tap at 75% thread.
- What drill for a M39x3 roll (form) tap?
- About 37.67 mm; the nearest standard drill is 37.5 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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