7.4 mm Drill Size

metric drill

7.4 mm 0.2913 in 7.40 mm

A 7.4 mm drill measures 0.2913 in. It taps 2 threads in this chart.

What a 7.4 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 7.4 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 0.75	61.6%	7.3 mm	71.9%
5/16-32	52.2%	9/32″	77.1%

Other jobs for a 7.4 mm

Hard-material tap drill: The size to use in stainless or tool steel for M8 x 0.75, where it leaves a shallower thread than the standard drill and cuts tapping torque.
Form-tap hole: The published roll-tap hole for M8 x 1.25. 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 →

7.4 mm drill: common questions

What size is a 7.4 mm drill?

0.2913 inches, which is 7.40 mm. It is a metric drill.

What can I tap with a 7.4 mm drill?

2 threads: M8 x 0.75 at 61.6%, 5/16-32 at 52.2%.

What drill is next to a 7.4 mm?

Down: L at 0.290 in. Up: M at 0.295 in.