2.1 mm Drill Size

metric drill

2.1 mm 0.0827 in 2.10 mm

A 2.1 mm drill measures 0.0827 in. It taps 3 threads in this chart.

What a 2.1 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 2.1 mm drill taps, with the percent of thread each one gets and the published chart drill for comparison.
Thread	% thread	Chart drill	Chart %
#3-56	70.3%	#45	73.3%
M2.5 x 0.45	68.4%	2.05 mm	77.0%
#3-48	60.2%	#47	75.7%

Drills either side

#45 0.082 in · 2.08 mm Next size down
2.15 mm 0.0846 in · 2.15 mm Next size up

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

2.1 mm drill: common questions

What size is a 2.1 mm drill?

0.0827 inches, which is 2.10 mm. It is a metric drill.

What can I tap with a 2.1 mm drill?

3 threads: #3-56 at 70.3%, M2.5 x 0.45 at 68.4%, #3-48 at 60.2%.

What drill is next to a 2.1 mm?

Down: #45 at 0.082 in. Up: 2.15 mm at 0.0846 in.