#44 Drill Size

number drill

#44 0.086 in 2.18 mm

A #44 drill measures 0.086 in. It taps 3 threads in this chart.

What a #44 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 #44 drill taps, with the percent of thread each one gets and the published chart drill for comparison.
Thread	% thread	Chart drill	Chart %
#4-40	80.1%	#43	70.8%
#3-56	56.0%	#45	73.3%
M2.5 x 0.45	54.1%	2.05 mm	77.0%

Other jobs for a #44

Hard-material tap drill: The size to use in stainless or tool steel for #3-56, where it leaves a shallower thread than the standard drill and cuts tapping torque.

Drills either side

2.15 mm 0.0846 in · 2.15 mm Next size down
2.2 mm 0.0866 in · 2.2 mm Next size up

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

#44 drill: common questions

What size is a #44 drill?

0.086 inches, which is 2.18 mm. It is a number drill.

What can I tap with a #44 drill?

3 threads: #4-40 at 80.1%, #3-56 at 56.0%, M2.5 x 0.45 at 54.1%.

What drill is next to a #44?

Down: 2.15 mm at 0.0846 in. Up: 2.2 mm at 0.0866 in.