5.1 mm Drill Size

metric drill

5.1 mm 0.2008 in 5.10 mm

A 5.1 mm drill measures 0.2008 in. It taps 2 threads in this chart.

What a 5.1 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 5.1 mm 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	75.7%	#7	75.4%
M6 x 1	69.3%	5 mm	77.0%

Drills either side

#8 0.199 in · 5.06 mm Next size down
#7 0.201 in · 5.11 mm Next size up

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

5.1 mm drill: common questions

What size is a 5.1 mm drill?

0.2008 inches, which is 5.10 mm. It is a metric drill.

What can I tap with a 5.1 mm drill?

2 threads: 1/4-20 at 75.7%, M6 x 1 at 69.3%.

What drill is next to a 5.1 mm?

Down: #8 at 0.199 in. Up: #7 at 0.201 in.