S Drill Size

A S letter drill is 0.3480" (8.839 mm).

Closest fraction: 11/32 (0.3438", under by 0.0042").

Next size down / up

Drill	Inch	mm
11/32	0.3438	8.731
9 mm	0.3543	9.000

Printable PDF version - Drill Size Chart
Clean letter-size sheet for the toolbox or shop wall. Instant download, $3.49.