#12 Drill Size

number drill

#12 0.189 in 4.80 mm

A #12 drill measures 0.189 in. It taps 2 threads in this chart.

What a #12 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 drill taps, with the percent of thread each one gets and the published chart drill for comparison.
Thread	% thread	Chart drill	Chart %
#12-32	66.5%	#13	76.4%
#12-28	58.2%	#14	73.3%

Drills either side

3/16″ 0.1875 in · 4.76 mm Next size down
4.8 mm 0.189 in · 4.8 mm Same diameter, different series

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

#12 drill: common questions

What size is a #12 drill?

0.189 inches, which is 4.80 mm. It is a number drill.

What can I tap with a #12 drill?

2 threads: #12-32 at 66.5%, #12-28 at 58.2%.

What drill is next to a #12?

Down: 3/16 in at 0.1875 in. Up: 4.8 mm at 0.189 in.