#52 Drill Size

number drill

#52 0.0635 in 1.61 mm

A #52 drill measures 0.0635 in. It taps 2 threads in this chart.

What a #52 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 #52 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	74.5%	1.6 mm	77.0%
#1-72	52.7%	#53	74.8%

Drills either side

1.6 mm 0.063 in · 1.6 mm Next size down
1.7 mm 0.0669 in · 1.7 mm Next size up

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

#52 drill: common questions

What size is a #52 drill?

0.0635 inches, which is 1.61 mm. It is a number drill.

What can I tap with a #52 drill?

2 threads: M2 x 0.4 at 74.5%, #1-72 at 52.7%.

What drill is next to a #52?

Down: 1.6 mm at 0.063 in. Up: 1.7 mm at 0.0669 in.