M1.6x0.35 tap drill size
Use a 1.25 mm drill (1.25 mm) for a M1.6x0.35 cutting tap at 75% thread.
| Tap type | Drill | Decimal (mm) |
|---|---|---|
| Cutting tap, 75% thread | 1.25 mm | 1.25 |
| Cutting tap, 50% thread (hard material) | 1.35 mm | 1.35 |
| Roll / form tap, 65% thread | 1.45 mm | 1.45 |
- Pitch
- 0.35 mm
- Major Ø
- 1.60
- Pitch Ø
- 1.37
- Minor Ø
- 1.22
M1.6x0.35 tapping speeds and feeds
Feed = pitch (0.35 mm per rev). Starting points for a general-purpose HSS cut tap:
- Aluminum 6061 / 7075: 4,240 RPM · 1484 mm/min
- Free-machining / mild steel: 1,210 RPM · 423 mm/min
- 304 / 316 stainless: 610 RPM · 214 mm/min
M1.6x0.35 tap speeds and feeds: all materials, form taps and G84 code · 1.25 mm drill size and speeds
Common questions
- What size drill for a M1.6x0.35 tap?
- Use a 1.25 mm drill (1.25 mm) for a M1.6x0.35 cutting tap at 75% thread.
- What drill for a M1.6x0.35 roll (form) tap?
- About 1.45 mm; the nearest standard drill is 1.45 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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