Tap Drill Size Chart

10.4 mm Drill Size

metric drill

10.4 mm 0.4094 in 10.40 mm

A 10.4 mm drill measures 0.4094 in. It taps 3 threads in this chart.

What a 10.4 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 10.4 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 1.5 82.1% 10.5 mm 77.0%
M12 x 1.75 70.4% 10.2 mm 79.2%
7/16-28 60.6% Y 72.2%

Drills either side

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10.4 mm drill: common questions

What size is a 10.4 mm drill?
0.4094 inches, which is 10.40 mm. It is a metric drill.
What can I tap with a 10.4 mm drill?
3 threads: M12 x 1.5 at 82.1%, M12 x 1.75 at 70.4%, 7/16-28 at 60.6%.
What drill is next to a 10.4 mm?
Down: 13/32 in at 0.4062 in. Up: Z at 0.413 in.