#22 Drill Size

number drill

#22 0.157 in 3.99 mm

A #22 drill measures 0.157 in. It taps 2 threads in this chart.

What a #22 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 #22 drill taps, with the percent of thread each one gets and the published chart drill for comparison.
Thread	% thread	Chart drill	Chart %
#10-32	81.3%	#21	76.4%
#10-24	61.0%	#25	74.8%

Other jobs for a #22

Hard-material tap drill: The size to use in stainless or tool steel for #10-24, where it leaves a shallower thread than the standard drill and cuts tapping torque.

Drills either side

5/32″ 0.1562 in · 3.97 mm Next size down
4 mm 0.1575 in · 4 mm Next size up

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

#22 drill: common questions

What size is a #22 drill?

0.157 inches, which is 3.99 mm. It is a number drill.

What can I tap with a #22 drill?

2 threads: #10-32 at 81.3%, #10-24 at 61.0%.

What drill is next to a #22?

Down: 5/32 in at 0.1562 in. Up: 4 mm at 0.1575 in.