What drill for a M3.5x0.6 roll (form) tap?

About 3.23 mm; the nearest standard drill is 3.2 mm. Check your tap maker's table.

M3.5x0.6 tap drill size

Use a 2.90 mm drill (2.90 mm) for a M3.5x0.6 cutting tap at 75% thread.

Drills for M3.5x0.6 (Metric)
Tap type	Drill	Decimal (mm)
Cutting tap, 75% thread	2.90 mm	2.90
Cutting tap, 50% thread (hard material)	3.1 mm	3.10
Roll / form tap, 65% thread	3.2 mm	3.20

Pitch: 0.6 mm
Major Ø: 3.50
Pitch Ø: 3.11
Minor Ø: 2.85

M3.5x0.6 tapping speeds and feeds

Feed = pitch (0.6 mm per rev). Starting points for a general-purpose HSS cut tap:

Aluminum 6061 / 7075: 1,940 RPM · 1164 mm/min
Free-machining / mild steel: 550 RPM · 330 mm/min
304 / 316 stainless: 280 RPM · 168 mm/min

M3.5x0.6 tap speeds and feeds: all materials, form taps and G84 code · 2.90 mm drill size and speeds

Open the tap drill calculator Roll tap chart Helicoil chart

Common questions

What size drill for a M3.5x0.6 tap?: Use a 2.90 mm drill (2.90 mm) for a M3.5x0.6 cutting tap at 75% thread.
What drill for a M3.5x0.6 roll (form) tap?: About 3.23 mm; the nearest standard drill is 3.2 mm. Check your tap maker's table.

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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