12.3 mm Drill Size

metric drill

12.3 mm 0.4843 in 12.30 mm

A 12.3 mm drill measures 0.4843 in. It taps 2 threads in this chart.

What a 12.3 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 12.3 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	72.2%	31/64″	72.1%
M14 x 2	65.4%	12 mm	77.0%

Drills either side

12.2 mm 0.4803 in · 12.2 mm Next size down
31/64″ 0.4844 in · 12.3 mm Next size up

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

12.3 mm drill: common questions

What size is a 12.3 mm drill?

0.4843 inches, which is 12.30 mm. It is a metric drill.

What can I tap with a 12.3 mm drill?

2 threads: 9/16-12 at 72.2%, M14 x 2 at 65.4%.

What drill is next to a 12.3 mm?

Down: 12.2 mm at 0.4803 in. Up: 31/64 in at 0.4844 in.