#2 Drill Size

number drill

#2 0.221 in 5.61 mm

A #2 drill measures 0.221 in. It taps 2 threads in this chart.

What a #2 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 #2 drill taps, with the percent of thread each one gets and the published chart drill for comparison.
Thread	% thread	Chart drill	Chart %
1/4-32	71.4%	7/32″	76.9%
1/4-28	62.5%	#3	79.8%

Other jobs for a #2

Hard-material tap drill: The size to use in stainless or tool steel for 1/4-28, where it leaves a shallower thread than the standard drill and cuts tapping torque.
Clearance hole: The through hole a bolt passes in, not a tapped hole: normal fit for #10-24, normal fit for #10-32. See the clearance hole chart.

Drills either side

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

#2 drill: common questions

What size is a #2 drill?

0.221 inches, which is 5.61 mm. It is a number drill.

What can I tap with a #2 drill?

2 threads: 1/4-32 at 71.4%, 1/4-28 at 62.5%.

Is a #2 drill used for clearance holes?

Yes: normal fit for #10-24, normal fit for #10-32. A clearance hole is not tapped; the bolt passes through it.

What drill is next to a #2?

Down: 5.6 mm at 0.2205 in. Up: 5.7 mm at 0.2244 in.