17.4 mm Drill Size

metric drill

17.4 mm 0.685 in 17.40 mm

A 17.4 mm drill measures 0.685 in. It taps 3 threads in this chart.

What a 17.4 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 17.4 mm drill taps, with the percent of thread each one gets and the published chart drill for comparison.
Thread	% thread	Chart drill	Chart %
M20 x 2.5	80.1%	17.5 mm	77.0%
3/4-16	80.1%	11/16″	77.0%
3/4-10	50.0%	21/32″	72.2%

Drills either side

17.3 mm 0.6811 in · 17.3 mm Next size down
11/16″ 0.6875 in · 17.46 mm Next size up

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

17.4 mm drill: common questions

What size is a 17.4 mm drill?

0.685 inches, which is 17.40 mm. It is a metric drill.

What can I tap with a 17.4 mm drill?

3 threads: M20 x 2.5 at 80.1%, 3/4-16 at 80.1%, 3/4-10 at 50.0%.

What drill is next to a 17.4 mm?

Down: 17.3 mm at 0.6811 in. Up: 11/16 in at 0.6875 in.