M8x1 tap drill size
Use a 7.00 mm drill (7.00 mm) for a M8x1 cutting tap at 75% thread.
| Tap type | Drill | Decimal (mm) |
|---|---|---|
| Cutting tap, 75% thread | 7.00 mm | 7.00 |
| Cutting tap, 50% thread (hard material) | 7.4 mm | 7.40 |
| Roll / form tap, 65% thread | 7.6 mm | 7.60 |
- Pitch
- 1 mm
- Major Ø
- 8.00
- Pitch Ø
- 7.35
- Minor Ø
- 6.92
M8x1 tapping speeds and feeds
Feed = pitch (1 mm per rev). Starting points for a general-purpose HSS cut tap:
- Aluminum 6061 / 7075: 850 RPM · 850 mm/min
- Free-machining / mild steel: 240 RPM · 240 mm/min
- 304 / 316 stainless: 120 RPM · 120 mm/min
Tap speeds and feeds by size · 7.00 mm drill size and speeds
Common questions
- What size drill for a M8x1 tap?
- Use a 7.00 mm drill (7.00 mm) for a M8x1 cutting tap at 75% thread.
- What drill for a M8x1 roll (form) tap?
- About 7.56 mm; the nearest standard drill is 7.6 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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