4.3 mm Drill Size

metric drill

4.3 mm 0.1693 in 4.30 mm

A 4.3 mm drill measures 0.1693 in. It taps 2 threads in this chart.

What a 4.3 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 4.3 mm drill taps, with the percent of thread each one gets and the published chart drill for comparison.
Thread	% thread	Chart drill	Chart %
M5 x 0.8	67.4%	4.2 mm	77.0%
#10-32	51.0%	#21	76.4%

Drills either side

#19 0.166 in · 4.22 mm Next size down
#18 0.1695 in · 4.31 mm Next size up

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

4.3 mm drill: common questions

What size is a 4.3 mm drill?

0.1693 inches, which is 4.30 mm. It is a metric drill.

What can I tap with a 4.3 mm drill?

2 threads: M5 x 0.8 at 67.4%, #10-32 at 51.0%.

What drill is next to a 4.3 mm?

Down: #19 at 0.166 in. Up: #18 at 0.1695 in.