7 mm Drill Size

metric drill

7 mm 0.2756 in 7.00 mm

A 7 mm drill is the standard tap drill for M8 x 1.

What a 7 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 7 mm drill taps, with the percent of thread each one gets and the published chart drill for comparison.
Thread	% thread	Chart drill	Chart %
M8 x 1 chart drill	77.0%	7 mm	77.0%
5/16-24	68.2%	I	74.8%
M8 x 1.25	61.6%	6.8 mm	73.9%
5/16-18	51.1%	F	76.9%

Other jobs for a 7 mm

Hard-material tap drill: The size to use in stainless or tool steel for M8 x 1.25, where it leaves a shallower thread than the standard drill and cuts tapping torque.

Drills either side

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

7 mm drill: common questions

What size is a 7 mm drill?

0.2756 inches, which is 7.00 mm. It is a metric drill.

What can I tap with a 7 mm drill?

4 threads: M8 x 1 at 77.0%, 5/16-24 at 68.2%, M8 x 1.25 at 61.6%, 5/16-18 at 51.1%.

Is a 7 mm drill the standard tap drill for anything?

Yes, for M8 x 1 (77.0% thread). That is the size published tap and drill charts give.

What drill is next to a 7 mm?

Down: I at 0.272 in. Up: J at 0.277 in.