#25 Drill Size

number drill

#25 0.1495 in 3.80 mm

A #25 drill is the standard tap drill for #10-24.

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

Other jobs for a #25

Form-tap hole: The published roll-tap hole for #8-32. A form tap displaces metal instead of cutting it, so it needs this larger hole.

Drills either side

#26 0.147 in · 3.73 mm Next size down
#24 0.152 in · 3.86 mm Next size up

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

#25 drill: common questions

What size is a #25 drill?

0.1495 inches, which is 3.80 mm. It is a number drill.

What can I tap with a #25 drill?

1 thread: #10-24 at 74.8%.

Is a #25 drill the standard tap drill for anything?

Yes, for #10-24 (74.8% thread). That is the size published tap and drill charts give.

What drill is next to a #25?

Down: #26 at 0.147 in. Up: #24 at 0.152 in.