13.1 mm Drill Size

metric drill

13.1 mm 0.5157 in 13.10 mm

A 13.1 mm drill measures 0.5157 in. It taps 2 threads in this chart.

What a 13.1 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 13.1 mm drill taps, with the percent of thread each one gets and the published chart drill for comparison.
Thread	% thread	Chart drill	Chart %
9/16-18	64.8%	33/64″	65.0%
M14 x 1.25	55.4%	12.8 mm	73.9%

Other jobs for a 13.1 mm

Form-tap hole: The published roll-tap hole for M14 x 2. A form tap displaces metal instead of cutting it, so it needs this larger hole.

Drills either side

33/64″ 0.5156 in · 13.1 mm Next size down
13.2 mm 0.5197 in · 13.2 mm Next size up

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

13.1 mm drill: common questions

What size is a 13.1 mm drill?

0.5157 inches, which is 13.10 mm. It is a metric drill.

What can I tap with a 13.1 mm drill?

2 threads: 9/16-18 at 64.8%, M14 x 1.25 at 55.4%.

What drill is next to a 13.1 mm?

Down: 33/64 in at 0.5156 in. Up: 13.2 mm at 0.5197 in.