30 mm Drill Size

metric drill

30 mm 1.1811 in 30.00 mm

A 30 mm drill measures 1.1811 in. It taps 2 threads in this chart.

What a 30 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 30 mm drill taps, with the percent of thread each one gets and the published chart drill for comparison.
Thread	% thread	Chart drill	Chart %
M33 x 3.5	66.0%	29.5 mm	77.0%
1-1/4-12	63.6%	1-11/64″	72.1%

Drills either side

1-11/64″ 1.1719 in · 29.77 mm Next size down
1-3/16″ 1.1875 in · 30.16 mm Next size up

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

30 mm drill: common questions

What size is a 30 mm drill?

1.1811 inches, which is 30.00 mm. It is a metric drill.

What can I tap with a 30 mm drill?

2 threads: M33 x 3.5 at 66.0%, 1-1/4-12 at 63.6%.

What drill is next to a 30 mm?

Down: 1-11/64 in at 1.1719 in. Up: 1-3/16 in at 1.1875 in.