18.6 mm Drill Size

metric drill

18.6 mm 0.7323 in 18.60 mm

A 18.6 mm drill measures 0.7323 in. It taps 2 threads in this chart.

What a 18.6 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 18.6 mm drill taps, with the percent of thread each one gets and the published chart drill for comparison.
Thread	% thread	Chart drill	Chart %
M20 x 1.5	71.9%	18.5 mm	77.0%
M20 x 2	53.9%	18 mm	77.0%

Drills either side

18.5 mm 0.7283 in · 18.5 mm Next size down
47/64″ 0.7344 in · 18.65 mm Next size up

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

18.6 mm drill: common questions

What size is a 18.6 mm drill?

0.7323 inches, which is 18.60 mm. It is a metric drill.

What can I tap with a 18.6 mm drill?

2 threads: M20 x 1.5 at 71.9%, M20 x 2 at 53.9%.

What drill is next to a 18.6 mm?

Down: 18.5 mm at 0.7283 in. Up: 47/64 in at 0.7344 in.