#73 drill bit size

#73 drill = .0240 in = 0.61 mm. Closest metric drill: 1 mm.

Nearby drill sizes

Drill	Type	Inch	mm	Difference
#77	number	.0180 in	0.457	-6.0 thou
#76	number	.0200 in	0.508	-4.0 thou
#75	number	.0210 in	0.533	-3.0 thou
#74	number	.0225 in	0.571	-1.5 thou
#73	number	.0240 in	0.610	0.0 thou
#72	number	.0250 in	0.635	1.0 thou
#71	number	.0260 in	0.660	2.0 thou
#70	number	.0280 in	0.711	4.0 thou
#69	number	.0292 in	0.742	5.2 thou

1 thou = 0.001 in = 0.0254 mm. Drills a few thou apart are usually interchangeable for clearance holes, but not for tap drills or reamer pilots.