#46 Drill Size

number drill

#46 0.081 in 2.06 mm

A #46 drill measures 0.081 in. It taps 3 threads in this chart.

What a #46 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 #46 drill taps, with the percent of thread each one gets and the published chart drill for comparison.
Thread	% thread	Chart drill	Chart %
#3-56	77.6%	#45	73.3%
M2.5 x 0.45	75.8%	2.05 mm	77.0%
#3-48	66.5%	#47	75.7%

Other jobs for a #46

Clearance hole: The through hole a bolt passes in, not a tapped hole: close fit for #1-64, close fit for #1-72. See the clearance hole chart.

Drills either side

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

#46 drill: common questions

What size is a #46 drill?

0.081 inches, which is 2.06 mm. It is a number drill.

What can I tap with a #46 drill?

3 threads: #3-56 at 77.6%, M2.5 x 0.45 at 75.8%, #3-48 at 66.5%.

Is a #46 drill used for clearance holes?

Yes: close fit for #1-64, close fit for #1-72. A clearance hole is not tapped; the bolt passes through it.

What drill is next to a #46?

Down: 2.05 mm at 0.0807 in. Up: #45 at 0.082 in.