1-37/64 in Drill Size

fractional drill

1-37/64″ 1.5781 in 40.08 mm

A 1-37/64 in drill measures 1.5781 in. It taps 2 threads in this chart.

What a 1-37/64 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 1-37/64 in drill taps, with the percent of thread each one gets and the published chart drill for comparison.
Thread	% thread	Chart drill	Chart %
M45 x 4.5	84.1%	40.5 mm	77.0%
M42 x 2	73.7%	40 mm	77.0%

Drills either side

40 mm 1.5748 in · 40 mm Next size down
1-19/32″ 1.5938 in · 40.48 mm Next size up

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

1-37/64 in drill: common questions

What size is a 1-37/64 in drill?

1.5781 inches, which is 40.08 mm. It is a fractional drill.

What can I tap with a 1-37/64 in drill?

2 threads: M45 x 4.5 at 84.1%, M42 x 2 at 73.7%.

What drill is next to a 1-37/64 in?

Down: 40 mm at 1.5748 in. Up: 1-19/32 in at 1.5938 in.