Tap Drill Size Chart

10.9 mm Drill Size

metric drill

10.9 mm 0.4291 in 10.90 mm

A 10.9 mm drill measures 0.4291 in. It taps 4 threads in this chart.

What a 10.9 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 10.9 mm drill taps, with the percent of thread each one gets and the published chart drill for comparison.
Thread % thread Chart drill Chart %
M12 x 1 84.7% 11 mm 77.0%
1/2-13 71.0% 27/64″ 78.2%
M12 x 1.25 67.7% 10.8 mm 73.9%
M12 x 1.5 56.5% 10.5 mm 77.0%

Drills either side

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10.9 mm drill: common questions

What size is a 10.9 mm drill?
0.4291 inches, which is 10.90 mm. It is a metric drill.
What can I tap with a 10.9 mm drill?
4 threads: M12 x 1 at 84.7%, 1/2-13 at 71.0%, M12 x 1.25 at 67.7%, M12 x 1.5 at 56.5%.
What drill is next to a 10.9 mm?
Down: 10.8 mm at 0.4252 in. Up: 11 mm at 0.4331 in.