39 mm Drill Size

metric drill

39 mm 1.5354 in 39.00 mm

A 39 mm drill is the standard tap drill for M42 x 3.

What a 39 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 39 mm drill taps, with the percent of thread each one gets and the published chart drill for comparison.
Thread	% thread	Chart drill	Chart %
M42 x 3 chart drill	77.0%	39 mm	77.0%
M42 x 4.5	51.3%	37.5 mm	77.0%

Drills either side

1-17/32″ 1.5312 in · 38.89 mm Next size down
40 mm 1.5748 in · 40 mm Next size up

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

39 mm drill: common questions

What size is a 39 mm drill?

1.5354 inches, which is 39.00 mm. It is a metric drill.

What can I tap with a 39 mm drill?

2 threads: M42 x 3 at 77.0%, M42 x 4.5 at 51.3%.

Is a 39 mm drill the standard tap drill for anything?

Yes, for M42 x 3 (77.0% thread). That is the size published tap and drill charts give.

What drill is next to a 39 mm?

Down: 1-17/32 in at 1.5312 in. Up: 40 mm at 1.5748 in.