21/32 inch in mm and decimal

21/32 in = 0.65625 in = 16.669 mm. Closest metric drill: 16.5 mm.

Taps that use a 21/32 drill

Drill	Type	Inch	mm	Difference
19/32	fraction	.5938 in	15.081	-62.5 thou
39/64	fraction	.6094 in	15.478	-46.9 thou
5/8	fraction	.6250 in	15.875	-31.3 thou
41/64	fraction	.6406 in	16.272	-15.6 thou
21/32	fraction	.6563 in	16.669	0.0 thou
43/64	fraction	.6719 in	17.066	15.6 thou
11/16	fraction	.6875 in	17.462	31.3 thou
45/64	fraction	.7031 in	17.859	46.9 thou
23/32	fraction	.7188 in	18.256	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.