28 mm Drill Size

metric drill

28 mm 1.1024 in 28.00 mm

A 28 mm drill is the standard tap drill for M30 x 2.

What a 28 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 28 mm drill taps, with the percent of thread each one gets and the published chart drill for comparison.
Thread	% thread	Chart drill	Chart %
1-1/4-7	79.5%	1-7/64″	75.8%
M30 x 2 chart drill	77.0%	28 mm	77.0%

Drills either side

27 mm 1.063 in · 27 mm Next size down
1-7/64″ 1.1094 in · 28.18 mm Next size up

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

28 mm drill: common questions

What size is a 28 mm drill?

1.1024 inches, which is 28.00 mm. It is a metric drill.

What can I tap with a 28 mm drill?

2 threads: 1-1/4-7 at 79.5%, M30 x 2 at 77.0%.

Is a 28 mm drill the standard tap drill for anything?

Yes, for M30 x 2 (77.0% thread). That is the size published tap and drill charts give.

What drill is next to a 28 mm?

Down: 27 mm at 1.063 in. Up: 1-7/64 in at 1.1094 in.