Y Drill Size

A Y letter drill is 0.4040" (10.262 mm).

Closest fraction: 13/32 (0.4062", over by 0.0022").

Next size down / up

Drill	Inch	mm
X	0.3970	10.084
13/32	0.4062	10.319

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