12.4 mm Drill Size

metric drill

12.4 mm 0.4882 in 12.40 mm

A 12.4 mm drill measures 0.4882 in. It taps 3 threads in this chart.

What a 12.4 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 12.4 mm drill taps, with the percent of thread each one gets and the published chart drill for comparison.
Thread	% thread	Chart drill	Chart %
M14 x 1.5	82.1%	12.5 mm	77.0%
9/16-12	68.6%	31/64″	72.1%
M14 x 2	61.6%	12 mm	77.0%

Other jobs for a 12.4 mm

Hard-material tap drill: The size to use in stainless or tool steel for M14 x 2, where it leaves a shallower thread than the standard drill and cuts tapping torque.

Drills either side

31/64″ 0.4844 in · 12.3 mm Next size down
12.5 mm 0.4921 in · 12.5 mm Next size up

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

12.4 mm drill: common questions

What size is a 12.4 mm drill?

0.4882 inches, which is 12.40 mm. It is a metric drill.

What can I tap with a 12.4 mm drill?

3 threads: M14 x 1.5 at 82.1%, 9/16-12 at 68.6%, M14 x 2 at 61.6%.

What drill is next to a 12.4 mm?

Down: 31/64 in at 0.4844 in. Up: 12.5 mm at 0.4921 in.