Tap Drill Size Chart

12.9 mm Drill Size

metric drill

12.9 mm 0.5079 in 12.90 mm

A 12.9 mm drill measures 0.5079 in. It taps 4 threads in this chart.

What a 12.9 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 12.9 mm drill taps, with the percent of thread each one gets and the published chart drill for comparison.
Thread % thread Chart drill Chart %
9/16-18 75.7% 33/64″ 65.0%
M14 x 1.25 67.7% 12.8 mm 73.9%
M14 x 1.5 56.5% 12.5 mm 77.0%
9/16-12 50.4% 31/64″ 72.1%

Drills either side

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12.9 mm drill: common questions

What size is a 12.9 mm drill?
0.5079 inches, which is 12.90 mm. It is a metric drill.
What can I tap with a 12.9 mm drill?
4 threads: 9/16-18 at 75.7%, M14 x 1.25 at 67.7%, M14 x 1.5 at 56.5%, 9/16-12 at 50.4%.
What drill is next to a 12.9 mm?
Down: 12.8 mm at 0.5039 in. Up: 13 mm at 0.5118 in.