Tap Drill Size Chart

17.5 mm Drill Size

metric drill

17.5 mm 0.689 in 17.50 mm

A 17.5 mm drill is the standard tap drill for M20 x 2.5.

What a 17.5 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 17.5 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 chart drill 77.0% 17.5 mm 77.0%
3/4-16 75.1% 11/16″ 77.0%

Drills either side

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17.5 mm drill: common questions

What size is a 17.5 mm drill?
0.689 inches, which is 17.50 mm. It is a metric drill.
What can I tap with a 17.5 mm drill?
2 threads: M20 x 2.5 at 77.0%, 3/4-16 at 75.1%.
Is a 17.5 mm drill the standard tap drill for anything?
Yes, for M20 x 2.5 (77.0% thread). That is the size published tap and drill charts give.
What drill is next to a 17.5 mm?
Down: 11/16 in at 0.6875 in. Up: 17.6 mm at 0.6929 in.