5.4 mm Drill Size

metric drill

5.4 mm 0.2126 in 5.40 mm

A 5.4 mm drill measures 0.2126 in. It taps 2 threads in this chart.

What a 5.4 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 5.4 mm drill taps, with the percent of thread each one gets and the published chart drill for comparison.
Thread	% thread	Chart drill	Chart %
1/4-28	80.6%	#3	79.8%
1/4-20	57.6%	#7	75.4%

Drills either side

#4 0.209 in · 5.31 mm Next size down
#3 0.213 in · 5.41 mm Next size up

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

5.4 mm drill: common questions

What size is a 5.4 mm drill?

0.2126 inches, which is 5.40 mm. It is a metric drill.

What can I tap with a 5.4 mm drill?

2 threads: 1/4-28 at 80.6%, 1/4-20 at 57.6%.

What drill is next to a 5.4 mm?

Down: #4 at 0.209 in. Up: #3 at 0.213 in.