37/64 in Drill Size

fractional drill

37/64″ 0.5781 in 14.68 mm

A 37/64 in drill is the standard tap drill for 5/8-18 and 5/8-24.

What a 37/64 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 37/64 in drill taps, with the percent of thread each one gets and the published chart drill for comparison.
Thread	% thread	Chart drill	Chart %
M16 x 1.5	67.5%	14.5 mm	77.0%
5/8-18 chart drill	65.0%	37/64″	65.0%
M16 x 2	50.7%	14 mm	77.0%

Other jobs for a 37/64 in

Form-tap hole: The published roll-tap hole for 5/8-11. A form tap displaces metal instead of cutting it, so it needs this larger hole.

Drills either side

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

37/64 in drill: common questions

What size is a 37/64 in drill?

0.5781 inches, which is 14.68 mm. It is a fractional drill.

What can I tap with a 37/64 in drill?

3 threads: M16 x 1.5 at 67.5%, 5/8-18 at 65.0%, M16 x 2 at 50.7%.

Is a 37/64 in drill the standard tap drill for anything?

Yes, for 5/8-18 (65.0% thread) and 5/8-24 (86.6% thread). That is the size published tap and drill charts give.

What drill is next to a 37/64 in?

Down: 14.6 mm at 0.5748 in. Up: 14.7 mm at 0.5787 in.