41/64 in Drill Size

fractional drill

41/64″ 0.6406 in 16.27 mm

A 41/64 in drill measures 0.6406 in. It taps 3 threads in this chart.

What a 41/64 in 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 41/64 in drill taps, with the percent of thread each one gets and the published chart drill for comparison.
Thread	% thread	Chart drill	Chart %
3/4-10	84.2%	21/32″	72.2%
M18 x 2	66.5%	16 mm	77.0%
M18 x 2.5	53.2%	15.5 mm	77.0%

Drills either side

16.2 mm 0.6378 in · 16.2 mm Next size down
16.3 mm 0.6417 in · 16.3 mm Next size up

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

41/64 in drill: common questions

What size is a 41/64 in drill?

0.6406 inches, which is 16.27 mm. It is a fractional drill.

What can I tap with a 41/64 in drill?

3 threads: 3/4-10 at 84.2%, M18 x 2 at 66.5%, M18 x 2.5 at 53.2%.

What drill is next to a 41/64 in?

Down: 16.2 mm at 0.6378 in. Up: 16.3 mm at 0.6417 in.