1-21/64 in Drill Size

fractional drill

1-21/64″ 1.3281 in 33.73 mm

A 1-21/64 in drill measures 1.3281 in. It taps 2 threads in this chart.

What a 1-21/64 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 1-21/64 in drill taps, with the percent of thread each one gets and the published chart drill for comparison.
Thread	% thread	Chart drill	Chart %
1-1/2-6	79.4%	1-11/32″	72.1%
M36 x 3	58.1%	33 mm	77.0%

Drills either side

33.5 mm 1.3189 in · 33.5 mm Next size down
34 mm 1.3386 in · 34 mm Next size up

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

1-21/64 in drill: common questions

What size is a 1-21/64 in drill?

1.3281 inches, which is 33.73 mm. It is a fractional drill.

What can I tap with a 1-21/64 in drill?

2 threads: 1-1/2-6 at 79.4%, M36 x 3 at 58.1%.

What drill is next to a 1-21/64 in?

Down: 33.5 mm at 1.3189 in. Up: 34 mm at 1.3386 in.