Tap Drill Size Chart

19.8 mm Drill Size

metric drill

19.8 mm 0.7795 in 19.80 mm

A 19.8 mm drill measures 0.7795 in. It taps 3 threads in this chart.

What a 19.8 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 19.8 mm drill taps, with the percent of thread each one gets and the published chart drill for comparison.
Thread % thread Chart drill Chart %
M22 x 2 84.7% 20 mm 77.0%
M22 x 2.5 67.7% 19.5 mm 77.0%
7/8-9 66.2% 49/64″ 75.8%

Drills either side

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19.8 mm drill: common questions

What size is a 19.8 mm drill?
0.7795 inches, which is 19.80 mm. It is a metric drill.
What can I tap with a 19.8 mm drill?
3 threads: M22 x 2 at 84.7%, M22 x 2.5 at 67.7%, 7/8-9 at 66.2%.
What drill is next to a 19.8 mm?
Down: 19.7 mm at 0.7756 in. Up: 25/32 in at 0.7812 in.