31/32 in Drill Size

fractional drill

31/32″ 0.9688 in 24.61 mm

A 31/32 in drill measures 0.9688 in. It taps 2 threads in this chart.

What a 31/32 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 31/32 in drill taps, with the percent of thread each one gets and the published chart drill for comparison.
Thread	% thread	Chart drill	Chart %
1-1/8-7	84.2%	63/64″	75.8%
M27 x 3	61.4%	24 mm	77.0%

Other jobs for a 31/32 in

Hard-material tap drill: The size to use in stainless or tool steel for 1-20, where it leaves a shallower thread than the standard drill and cuts tapping torque.
Form-tap hole: The published roll-tap hole for 1-12. A form tap displaces metal instead of cutting it, so it needs this larger hole.

Drills either side

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31/32 in drill: common questions

What size is a 31/32 in drill?

0.9688 inches, which is 24.61 mm. It is a fractional drill.

What can I tap with a 31/32 in drill?

2 threads: 1-1/8-7 at 84.2%, M27 x 3 at 61.4%.

What drill is next to a 31/32 in?

Down: 24.5 mm at 0.9646 in. Up: 25 mm at 0.9843 in.