"Tom" wrote
Size wise the 6 designates a single row deep
groove ball bearing, the 2 designates the size
series, the 05 designates a 25 mm bore (last
two numbers times 5) and the C3 designates
greater than normal internal clearance so ...

(Vox Darth Vader) Impressive.

(Note to self: Will seek out Tom Carlson next time I have a bearing
question.)