Tap Drill Size Chart

1-3/64 in Drill Size

fractional drill

1-3/64″ 1.0469 in 26.59 mm

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

What a 1-3/64 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 1-3/64 in drill taps, with the percent of thread each one gets and the published chart drill for comparison.
Thread % thread Chart drill Chart %
M30 x 3.5 75.0% 26.5 mm 77.0%
1-1/8-12 chart drill 72.1% 1-3/64″ 72.1%

Drills either side

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

1-3/64 in drill: common questions

What size is a 1-3/64 in drill?
1.0469 inches, which is 26.59 mm. It is a fractional drill.
What can I tap with a 1-3/64 in drill?
2 threads: M30 x 3.5 at 75.0%, 1-1/8-12 at 72.1%.
Is a 1-3/64 in drill the standard tap drill for anything?
Yes, for 1-1/8-12 (72.1% thread). That is the size published tap and drill charts give.
What drill is next to a 1-3/64 in?
Down: 26.5 mm at 1.0433 in. Up: 1-1/16 in at 1.0625 in.