12.1 mm Drill Size

metric drill

12.1 mm 0.4764 in 12.10 mm

A 12.1 mm drill measures 0.4764 in. It taps 3 threads in this chart.

What a 12.1 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 12.1 mm drill taps, with the percent of thread each one gets and the published chart drill for comparison.
Thread	% thread	Chart drill	Chart %
9/16-12	79.5%	31/64″	72.1%
M14 x 2	73.1%	12 mm	77.0%
1/2-28	50.9%	15/32″	67.2%

Drills either side

12 mm 0.4724 in · 12 mm Next size down
12.2 mm 0.4803 in · 12.2 mm Next size up

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

12.1 mm drill: common questions

What size is a 12.1 mm drill?

0.4764 inches, which is 12.10 mm. It is a metric drill.

What can I tap with a 12.1 mm drill?

3 threads: 9/16-12 at 79.5%, M14 x 2 at 73.1%, 1/2-28 at 50.9%.

What drill is next to a 12.1 mm?

Down: 12 mm at 0.4724 in. Up: 12.2 mm at 0.4803 in.