1-7/64 in Drill Size

fractional drill

1-7/64″ 1.1094 in 28.18 mm

A 1-7/64 in drill is the standard tap drill for 1-1/4-7.

What a 1-7/64 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 1-7/64 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 chart drill	75.8%	1-7/64″	75.8%
M30 x 2	70.1%	28 mm	77.0%

Drills either side

28 mm 1.1024 in · 28 mm Next size down
28.5 mm 1.122 in · 28.5 mm Next size up

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

1-7/64 in drill: common questions

What size is a 1-7/64 in drill?

1.1094 inches, which is 28.18 mm. It is a fractional drill.

What can I tap with a 1-7/64 in drill?

2 threads: 1-1/4-7 at 75.8%, M30 x 2 at 70.1%.

Is a 1-7/64 in drill the standard tap drill for anything?

Yes, for 1-1/4-7 (75.8% thread). That is the size published tap and drill charts give.

What drill is next to a 1-7/64 in?

Down: 28 mm at 1.1024 in. Up: 28.5 mm at 1.122 in.