M16×2.0 tap drill size
Use a 14.0mm drill (14.00 mm) for a M16×2.0 cutting tap at 75% thread.
| Tap type | Drill | Decimal (mm) |
|---|---|---|
| Cutting tap, 75% thread | 14.0mm | 14.00 |
| Cutting tap, 50% thread (hard material) | 14.75mm | 14.75 |
| Roll / form tap, 65% thread | 15.10 mm | 15.10 |
| Helicoil / STI insert (M16×2.0×1D) | 17.0mm | 17.00 |
- Pitch
- 2 mm
- Major Ø
- 16.00
- Pitch Ø
- 14.70
- Minor Ø
- 13.84
M16×2.0 tapping speeds and feeds
Feed = pitch (2 mm per rev). Starting points for a general-purpose HSS cut tap:
- Aluminum 6061 / 7075: 420 RPM · 840 mm/min
- Free-machining / mild steel: 120 RPM · 240 mm/min
- 304 / 316 stainless: 60 RPM · 120 mm/min
M16×2.0 tap speeds and feeds: all materials, form taps and G84 code · 14.0mm drill size and speeds
Common questions
- What size drill for a M16×2.0 tap?
- Use a 14.0mm drill (14.00 mm) for a M16×2.0 cutting tap at 75% thread.
- What drill for a M16×2.0 roll (form) tap?
- About 15.12 mm; the nearest standard drill is 15.10 mm. Check your tap maker's table.
- What drill for a M16×2.0 Helicoil?
- Drill 17.0mm (17.00 mm), then tap with the M16×2.0 STI tap.
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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