25 mm Drill Size

metric drill

25 mm 0.9843 in 25.00 mm

A 25 mm drill is the standard tap drill for M27 x 2.

What a 25 mm 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 mm drill taps, with the percent of thread each one gets and the published chart drill for comparison.
Thread	% thread	Chart drill	Chart %
M27 x 2 chart drill	77.0%	25 mm	77.0%
1-1/8-7	75.8%	63/64″	75.8%
M27 x 3	51.3%	24 mm	77.0%

Drills either side

31/32″ 0.9688 in · 24.61 mm Next size down
63/64″ 0.9844 in · 25 mm Next size up

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

25 mm drill: common questions

What size is a 25 mm drill?

0.9843 inches, which is 25.00 mm. It is a metric drill.

What can I tap with a 25 mm drill?

3 threads: M27 x 2 at 77.0%, 1-1/8-7 at 75.8%, M27 x 3 at 51.3%.

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

Yes, for M27 x 2 (77.0% thread). That is the size published tap and drill charts give.

What drill is next to a 25 mm?

Down: 31/32 in at 0.9688 in. Up: 63/64 in at 0.9844 in.