1-3/16 in Drill Size

fractional drill

1-3/16″ 1.1875 in 30.16 mm

A 1-3/16 in drill measures 1.1875 in. It taps 2 threads in this chart.

What a 1-3/16 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 1-3/16 in drill taps, with the percent of thread each one gets and the published chart drill for comparison.
Thread	% thread	Chart drill	Chart %
M33 x 3.5	62.4%	29.5 mm	77.0%
1-1/4-12	57.7%	1-11/64″	72.1%

Other jobs for a 1-3/16 in

Hard-material tap drill: The size to use in stainless or tool steel for 1-1/4-12, where it leaves a shallower thread than the standard drill and cuts tapping torque.
Form-tap hole: The published roll-tap hole for 1-1/4-7. A form tap displaces metal instead of cutting it, so it needs this larger hole.

Drills either side

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1-3/16 in drill: common questions

What size is a 1-3/16 in drill?

1.1875 inches, which is 30.16 mm. It is a fractional drill.

What can I tap with a 1-3/16 in drill?

2 threads: M33 x 3.5 at 62.4%, 1-1/4-12 at 57.7%.

What drill is next to a 1-3/16 in?

Down: 30 mm at 1.1811 in. Up: 30.5 mm at 1.2008 in.