#66 Drill Size

A #66 number drill is 0.0330" (0.838 mm).

Closest fraction: 1/32 (0.0312", under by 0.0018").

Next size down / up

Drill	Inch	mm
#67	0.0320	0.813
#65	0.0350	0.889

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