Cydrome Leader fired this volley in news:mdjf33
:

they're Fafnir 202KDD5, which is apparently really common in old
drill presses and have a 5/8" bore and metric OD. Yeah- they're really
metric OD with an inch bore. I can't figure out what the 5 at the end of
part number is

That combination of metric vs. imperial is common-enough. I haven't looked
up the Fafnir numbers, but the 5 is probably the 'precision number' of the
bearing.

LLoyd