#49 Drill Size

number drill

#49 0.073 in 1.85 mm

A #49 drill measures 0.073 in. It taps 2 threads in this chart.

What a #49 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 #49 drill taps, with the percent of thread each one gets and the published chart drill for comparison.
Thread	% thread	Chart drill	Chart %
#2-64	64.0%	#50	78.8%
#2-56	56.0%	#50	69.0%

Other jobs for a #49

Hard-material tap drill: The size to use in stainless or tool steel for #2-56, #2-64, where it leaves a shallower thread than the standard drill and cuts tapping torque.

Drills either side

1.85 mm 0.0728 in · 1.85 mm Next size down
#48 0.076 in · 1.93 mm Next size up

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

#49 drill: common questions

What size is a #49 drill?

0.073 inches, which is 1.85 mm. It is a number drill.

What can I tap with a #49 drill?

2 threads: #2-64 at 64.0%, #2-56 at 56.0%.

What drill is next to a #49?

Down: 1.85 mm at 0.0728 in. Up: #48 at 0.076 in.