Tap Drill Size Chart

15.8 mm Drill Size

metric drill

15.8 mm 0.622 in 15.80 mm

A 15.8 mm drill measures 0.622 in. It taps 2 threads in this chart.

What a 15.8 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 15.8 mm drill taps, with the percent of thread each one gets and the published chart drill for comparison.
Thread % thread Chart drill Chart %
M18 x 2 84.7% 16 mm 77.0%
M18 x 2.5 67.7% 15.5 mm 77.0%

Drills either side

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15.8 mm drill: common questions

What size is a 15.8 mm drill?
0.622 inches, which is 15.80 mm. It is a metric drill.
What can I tap with a 15.8 mm drill?
2 threads: M18 x 2 at 84.7%, M18 x 2.5 at 67.7%.
What drill is next to a 15.8 mm?
Down: 15.3 mm at 0.6024 in. Up: 5/8 in at 0.625 in.