51/64 inch in mm and decimal

51/64 in = 0.796875 in = 20.241 mm. Closest metric drill: 20 mm.

Nearby drill sizes

Drill	Type	Inch	mm	Difference
47/64	fraction	.7344 in	18.653	-62.5 thou
3/4	fraction	.7500 in	19.050	-46.9 thou
49/64	fraction	.7656 in	19.447	-31.3 thou
25/32	fraction	.7813 in	19.844	-15.6 thou
51/64	fraction	.7969 in	20.241	0.0 thou
13/16	fraction	.8125 in	20.637	15.6 thou
53/64	fraction	.8281 in	21.034	31.3 thou
27/32	fraction	.8438 in	21.431	46.9 thou
55/64	fraction	.8594 in	21.828	62.5 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.