3/8 inch in mm and decimal

3/8 in = 0.375 in = 9.525 mm. Closest metric drill: 9.5 mm.

Nearby drill sizes

Drill	Type	Inch	mm	Difference
S	letter	.3480 in	8.839	-27.0 thou
T	letter	.3580 in	9.093	-17.0 thou
23/64	fraction	.3594 in	9.128	-15.6 thou
U	letter	.3680 in	9.347	-7.0 thou
3/8	fraction	.3750 in	9.525	0.0 thou
V	letter	.3770 in	9.576	2.0 thou
W	letter	.3860 in	9.804	11.0 thou
25/64	fraction	.3906 in	9.922	15.6 thou
X	letter	.3970 in	10.084	22.0 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.