Tap Drill Size Chart

19.9 mm Drill Size

metric drill

19.9 mm 0.7835 in 19.90 mm

A 19.9 mm drill measures 0.7835 in. It taps 3 threads in this chart.

What a 19.9 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 19.9 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 80.8% 20 mm 77.0%
M22 x 2.5 64.7% 19.5 mm 77.0%
7/8-9 63.4% 49/64″ 75.8%

Drills either side

All drill sizes → · Open this drill in the calculator →

19.9 mm drill: common questions

What size is a 19.9 mm drill?
0.7835 inches, which is 19.90 mm. It is a metric drill.
What can I tap with a 19.9 mm drill?
3 threads: M22 x 2 at 80.8%, M22 x 2.5 at 64.7%, 7/8-9 at 63.4%.
What drill is next to a 19.9 mm?
Down: 25/32 in at 0.7812 in. Up: 20 mm at 0.7874 in.