Tap Drill Size Chart

17.9 mm Drill Size

metric drill

17.9 mm 0.7047 in 17.90 mm

A 17.9 mm drill measures 0.7047 in. It taps 4 threads in this chart.

What a 17.9 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 17.9 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 80.8% 18 mm 77.0%
3/4-20 69.7% 45/64″ 72.2%
M20 x 2.5 64.7% 17.5 mm 77.0%
3/4-16 55.8% 11/16″ 77.0%

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17.9 mm drill: common questions

What size is a 17.9 mm drill?
0.7047 inches, which is 17.90 mm. It is a metric drill.
What can I tap with a 17.9 mm drill?
4 threads: M20 x 2 at 80.8%, 3/4-20 at 69.7%, M20 x 2.5 at 64.7%, 3/4-16 at 55.8%.
What drill is next to a 17.9 mm?
Down: 45/64 in at 0.7031 in. Up: 18 mm at 0.7087 in.