#17 Drill Size

number drill

#17 0.173 in 4.39 mm

A #17 drill measures 0.173 in. It taps 2 threads in this chart.

What a #17 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 drill taps, with the percent of thread each one gets and the published chart drill for comparison.
Thread	% thread	Chart drill	Chart %
#12-24	79.4%	#16	72.1%
M5 x 0.8	58.3%	4.2 mm	77.0%

Drills either side

11/64″ 0.1719 in · 4.37 mm Next size down
4.4 mm 0.1732 in · 4.4 mm Next size up

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

#17 drill: common questions

What size is a #17 drill?

0.173 inches, which is 4.39 mm. It is a number drill.

What can I tap with a #17 drill?

2 threads: #12-24 at 79.4%, M5 x 0.8 at 58.3%.

What drill is next to a #17?

Down: 11/64 in at 0.1719 in. Up: 4.4 mm at 0.1732 in.