13/16 in Drill Size

fractional drill

13/16″ 0.8125 in 20.64 mm

A 13/16 in drill is the standard tap drill for 7/8-14.

What a 13/16 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 13/16 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 1.5	70.0%	20.5 mm	77.0%
7/8-14 chart drill	67.4%	13/16″	67.4%
M22 x 2	52.5%	20 mm	77.0%

Other jobs for a 13/16 in

Clearance hole: The through hole a bolt passes in, not a tapped hole: normal fit for 3/4-10, normal fit for 3/4-16, normal fit for 3/4-20. See the clearance hole chart.

Drills either side

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13/16 in drill: common questions

What size is a 13/16 in drill?

0.8125 inches, which is 20.64 mm. It is a fractional drill.

What can I tap with a 13/16 in drill?

3 threads: M22 x 1.5 at 70.0%, 7/8-14 at 67.4%, M22 x 2 at 52.5%.

Is a 13/16 in drill the standard tap drill for anything?

Yes, for 7/8-14 (67.4% thread). That is the size published tap and drill charts give.

Is a 13/16 in drill used for clearance holes?

Yes: normal fit for 3/4-10, normal fit for 3/4-16, normal fit for 3/4-20. A clearance hole is not tapped; the bolt passes through it.

What drill is next to a 13/16 in?

Down: 20.5 mm at 0.8071 in. Up: 21 mm at 0.8268 in.