Tap Drill Size Chart

16.9 mm Drill Size

metric drill

16.9 mm 0.6654 in 16.90 mm

A 16.9 mm drill measures 0.6654 in. It taps 3 threads in this chart.

What a 16.9 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 16.9 mm drill taps, with the percent of thread each one gets and the published chart drill for comparison.
Thread % thread Chart drill Chart %
M18 x 1 84.7% 17 mm 77.0%
3/4-10 65.1% 21/32″ 72.2%
M18 x 1.5 56.5% 16.5 mm 77.0%

Other jobs for a 16.9 mm

Form-tap hole
The published roll-tap hole for M18 x 2.5. 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 →

16.9 mm drill: common questions

What size is a 16.9 mm drill?
0.6654 inches, which is 16.90 mm. It is a metric drill.
What can I tap with a 16.9 mm drill?
3 threads: M18 x 1 at 84.7%, 3/4-10 at 65.1%, M18 x 1.5 at 56.5%.
What drill is next to a 16.9 mm?
Down: 16.8 mm at 0.6614 in. Up: 17 mm at 0.6693 in.