1-13/64 in Drill Size

fractional drill

1-13/64″ 1.2031 in 30.56 mm

A 1-13/64 in drill measures 1.2031 in. It taps 2 threads in this chart.

What a 1-13/64 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 1-13/64 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	79.4%	1-7/32″	72.1%
M33 x 3.5	53.7%	29.5 mm	77.0%

Drills either side

30.5 mm 1.2008 in · 30.5 mm Next size down
1-7/32″ 1.2188 in · 30.96 mm Next size up

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

1-13/64 in drill: common questions

What size is a 1-13/64 in drill?

1.2031 inches, which is 30.56 mm. It is a fractional drill.

What can I tap with a 1-13/64 in drill?

2 threads: 1-3/8-6 at 79.4%, M33 x 3.5 at 53.7%.

What drill is next to a 1-13/64 in?

Down: 30.5 mm at 1.2008 in. Up: 1-7/32 in at 1.2188 in.