1-19/64 in Drill Size

fractional drill

1-19/64″ 1.2969 in 32.94 mm

A 1-19/64 in drill is the standard tap drill for 1-3/8-12.

What a 1-19/64 in 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 1-19/64 in drill taps, with the percent of thread each one gets and the published chart drill for comparison.
Thread	% thread	Chart drill	Chart %
M36 x 3	78.5%	33 mm	77.0%
1-3/8-12 chart drill	72.1%	1-19/64″	72.1%
M36 x 4	58.9%	32 mm	77.0%

Other jobs for a 1-19/64 in

Form-tap hole: The published roll-tap hole for 1-3/8-6. 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 →

1-19/64 in drill: common questions

What size is a 1-19/64 in drill?

1.2969 inches, which is 32.94 mm. It is a fractional drill.

What can I tap with a 1-19/64 in drill?

3 threads: M36 x 3 at 78.5%, 1-3/8-12 at 72.1%, M36 x 4 at 58.9%.

Is a 1-19/64 in drill the standard tap drill for anything?

Yes, for 1-3/8-12 (72.1% thread). That is the size published tap and drill charts give.

What drill is next to a 1-19/64 in?

Down: 1-17/64 in at 1.2656 in. Up: 33 mm at 1.2992 in.