Tap Drill Size Chart

8.5 mm Drill Size

metric drill

8.5 mm 0.3346 in 8.50 mm

A 8.5 mm drill is the standard tap drill for M10 x 1.5.

What a 8.5 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 8.5 mm drill taps, with the percent of thread each one gets and the published chart drill for comparison.
Thread % thread Chart drill Chart %
M10 x 1.5 chart drill 77.0% 8.5 mm 77.0%
3/8-24 74.6% Q 79.4%

Drills either side

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8.5 mm drill: common questions

What size is a 8.5 mm drill?
0.3346 inches, which is 8.50 mm. It is a metric drill.
What can I tap with a 8.5 mm drill?
2 threads: M10 x 1.5 at 77.0%, 3/8-24 at 74.6%.
Is a 8.5 mm drill the standard tap drill for anything?
Yes, for M10 x 1.5 (77.0% thread). That is the size published tap and drill charts give.
What drill is next to a 8.5 mm?
Down: Q at 0.332 in. Up: 8.6 mm at 0.3386 in.