1-15/64 in Drill Size

fractional drill

1-15/64″ 1.2344 in 31.35 mm

A 1-15/64 in drill measures 1.2344 in. It taps 2 threads in this chart.

What a 1-15/64 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 1-15/64 in drill taps, with the percent of thread each one gets and the published chart drill for comparison.
Thread	% thread	Chart drill	Chart %
1-3/8-6	64.9%	1-7/32″	72.1%
M33 x 2	63.4%	31 mm	77.0%

Drills either side

31 mm 1.2205 in · 31 mm Next size down
31.5 mm 1.2402 in · 31.5 mm Next size up

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

1-15/64 in drill: common questions

What size is a 1-15/64 in drill?

1.2344 inches, which is 31.35 mm. It is a fractional drill.

What can I tap with a 1-15/64 in drill?

2 threads: 1-3/8-6 at 64.9%, M33 x 2 at 63.4%.

What drill is next to a 1-15/64 in?

Down: 31 mm at 1.2205 in. Up: 31.5 mm at 1.2402 in.