1-9/64 in Drill Size

fractional drill

1-9/64″ 1.1406 in 28.97 mm

A 1-9/64 in drill measures 1.1406 in. It taps 2 threads in this chart.

What a 1-9/64 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 1-9/64 in 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	59.0%	1-7/64″	75.8%
M30 x 1.5	52.8%	28.5 mm	77.0%

Other jobs for a 1-9/64 in

Hard-material tap drill: The size to use in stainless or tool steel for 1-1/4-7, where it leaves a shallower thread than the standard drill and cuts tapping torque.

Drills either side

1-1/8″ 1.125 in · 28.58 mm Next size down
29 mm 1.1417 in · 29 mm Next size up

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

1-9/64 in drill: common questions

What size is a 1-9/64 in drill?

1.1406 inches, which is 28.97 mm. It is a fractional drill.

What can I tap with a 1-9/64 in drill?

2 threads: 1-1/4-7 at 59.0%, M30 x 1.5 at 52.8%.

What drill is next to a 1-9/64 in?

Down: 1-1/8 in at 1.125 in. Up: 29 mm at 1.1417 in.