49/64 in Drill Size

fractional drill

49/64″ 0.7656 in 19.45 mm

A 49/64 in drill is the standard tap drill for 7/8-9.

What a 49/64 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 49/64 in drill taps, with the percent of thread each one gets and the published chart drill for comparison.
Thread	% thread	Chart drill	Chart %
M22 x 2.5	78.6%	19.5 mm	77.0%
7/8-9 chart drill	75.8%	49/64″	75.8%

Drills either side

19.4 mm 0.7638 in · 19.4 mm Next size down
19.5 mm 0.7677 in · 19.5 mm Next size up

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

49/64 in drill: common questions

What size is a 49/64 in drill?

0.7656 inches, which is 19.45 mm. It is a fractional drill.

What can I tap with a 49/64 in drill?

2 threads: M22 x 2.5 at 78.6%, 7/8-9 at 75.8%.

Is a 49/64 in drill the standard tap drill for anything?

Yes, for 7/8-9 (75.8% thread). That is the size published tap and drill charts give.

What drill is next to a 49/64 in?

Down: 19.4 mm at 0.7638 in. Up: 19.5 mm at 0.7677 in.