18.3 mm Drill Size

metric drill

18.3 mm 0.7205 in 18.30 mm

A 18.3 mm drill measures 0.7205 in. It taps 2 threads in this chart.

What a 18.3 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 18.3 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 2	65.4%	18 mm	77.0%
M20 x 2.5	52.3%	17.5 mm	77.0%

Drills either side

23/32″ 0.7188 in · 18.26 mm Next size down
18.4 mm 0.7244 in · 18.4 mm Next size up

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

18.3 mm drill: common questions

What size is a 18.3 mm drill?

0.7205 inches, which is 18.30 mm. It is a metric drill.

What can I tap with a 18.3 mm drill?

2 threads: M20 x 2 at 65.4%, M20 x 2.5 at 52.3%.

What drill is next to a 18.3 mm?

Down: 23/32 in at 0.7188 in. Up: 18.4 mm at 0.7244 in.