1.25 mm Drill Size

metric drill

1.25 mm 0.0492 in 1.25 mm

A 1.25 mm drill is the standard tap drill for M1.6 x 0.35.

What a 1.25 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 1.25 mm drill taps, with the percent of thread each one gets and the published chart drill for comparison.
Thread	% thread	Chart drill	Chart %
M1.6 x 0.35 chart drill	77.0%	1.25 mm	77.0%
#0-80	66.5%	3/64″	80.7%

Other jobs for a 1.25 mm

Form-tap hole: The published roll-tap hole for M1.4 x 0.3. A form tap displaces metal instead of cutting it, so it needs this larger hole.

Drills either side

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

1.25 mm drill: common questions

What size is a 1.25 mm drill?

0.0492 inches, which is 1.25 mm. It is a metric drill.

What can I tap with a 1.25 mm drill?

2 threads: M1.6 x 0.35 at 77.0%, #0-80 at 66.5%.

Is a 1.25 mm drill the standard tap drill for anything?

Yes, for M1.6 x 0.35 (77.0% thread). That is the size published tap and drill charts give.

What drill is next to a 1.25 mm?

Down: 1.2 mm at 0.0472 in. Up: 1.3 mm at 0.0512 in.