#6 Drill Size

number drill

#6 0.204 in 5.18 mm

A #6 drill measures 0.204 in. It taps 2 threads in this chart.

What a #6 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 #6 drill taps, with the percent of thread each one gets and the published chart drill for comparison.
Thread	% thread	Chart drill	Chart %
1/4-20	70.8%	#7	75.4%
M6 x 1	63.0%	5 mm	77.0%

Drills either side

13/64″ 0.2031 in · 5.16 mm Next size down
5.2 mm 0.2047 in · 5.2 mm Next size up

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

#6 drill: common questions

What size is a #6 drill?

0.204 inches, which is 5.18 mm. It is a number drill.

What can I tap with a #6 drill?

2 threads: 1/4-20 at 70.8%, M6 x 1 at 63.0%.

What drill is next to a #6?

Down: 13/64 in at 0.2031 in. Up: 5.2 mm at 0.2047 in.