1-25/64 in Drill Size

fractional drill

1-25/64″ 1.3906 in 35.32 mm

A 1-25/64 in drill measures 1.3906 in. It taps 2 threads in this chart.

What a 1-25/64 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 1-25/64 in drill taps, with the percent of thread each one gets and the published chart drill for comparison.
Thread	% thread	Chart drill	Chart %
M39 x 4	70.8%	35 mm	77.0%
1-1/2-6	50.5%	1-11/32″	72.1%

Drills either side

35 mm 1.378 in · 35 mm Next size down
36 mm 1.4173 in · 36 mm Next size up

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

1-25/64 in drill: common questions

What size is a 1-25/64 in drill?

1.3906 inches, which is 35.32 mm. It is a fractional drill.

What can I tap with a 1-25/64 in drill?

2 threads: M39 x 4 at 70.8%, 1-1/2-6 at 50.5%.

What drill is next to a 1-25/64 in?

Down: 35 mm at 1.378 in. Up: 36 mm at 1.4173 in.