1.6 mm Drill Size

metric drill

1.6 mm 0.063 in 1.60 mm

A 1.6 mm drill is the standard tap drill for M2 x 0.4.

What a 1.6 mm drill taps

Every thread this drill cuts between 50% and 85% of thread, deepest first. Outside that band it is the wrong drill for the job, so nothing below that line is listed.

Threads a 1.6 mm drill taps, with the percent of thread each one gets and the published chart drill for comparison.
Thread	% thread	Chart drill	Chart %
M2 x 0.4 chart drill	77.0%	1.6 mm	77.0%
#1-72	55.4%	#53	74.8%

Drills either side

1/16″ 0.0625 in · 1.59 mm Next size down
#52 0.0635 in · 1.61 mm Next size up

All drill sizes → · Open this drill in the calculator →

1.6 mm drill: common questions

What size is a 1.6 mm drill?

0.063 inches, which is 1.60 mm. It is a metric drill.

What can I tap with a 1.6 mm drill?

2 threads: M2 x 0.4 at 77.0%, #1-72 at 55.4%.

Is a 1.6 mm drill the standard tap drill for anything?

Yes, for M2 x 0.4 (77.0% thread). That is the size published tap and drill charts give.

What drill is next to a 1.6 mm?

Down: 1/16 in at 0.0625 in. Up: #52 at 0.0635 in.