Tap Drill Size Chart

#24 Drill Size

number drill

#24 0.152 in 3.86 mm

A #24 drill measures 0.152 in. It taps 1 thread in this chart.

What a #24 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 #24 drill taps, with the percent of thread each one gets and the published chart drill for comparison.
Thread % thread Chart drill Chart %
#10-24 70.2% #25 74.8%

Other jobs for a #24

Form-tap hole
The published roll-tap hole for #8-36. A form tap displaces metal instead of cutting it, so it needs this larger hole.

Drills either side

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

#24 drill: common questions

What size is a #24 drill?
0.152 inches, which is 3.86 mm. It is a number drill.
What can I tap with a #24 drill?
1 thread: #10-24 at 70.2%.
What drill is next to a #24?
Down: #25 at 0.1495 in. Up: #23 at 0.154 in.