Tap Drill Size Chart

8.7 mm Drill Size

metric drill

8.7 mm 0.3425 in 8.70 mm

A 8.7 mm drill measures 0.3425 in. It taps 4 threads in this chart.

What a 8.7 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 8.7 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 1.25 80.1% 8.8 mm 73.9%
3/8-32 80.1% 11/32″ 76.9%
M10 x 1.5 66.7% 8.5 mm 77.0%
3/8-24 60.0% Q 79.4%

Drills either side

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8.7 mm drill: common questions

What size is a 8.7 mm drill?
0.3425 inches, which is 8.70 mm. It is a metric drill.
What can I tap with a 8.7 mm drill?
4 threads: M10 x 1.25 at 80.1%, 3/8-32 at 80.1%, M10 x 1.5 at 66.7%, 3/8-24 at 60.0%.
What drill is next to a 8.7 mm?
Down: R at 0.339 in. Up: 11/32 in at 0.3438 in.