20 mm x 42 mm x 12 mm KOYO NC6004 deep groove ball bearings

The online 20 mm x 42 mm x 12 mm KOYO NC6004 deep groove ball bearings 60.000 mm d parts store gives you immediate access to a selection of more than 1.4 20 mm x 42 mm x 12 mm million new, LYC BEARING CORP.OF German LTD. 78000 N Basic Radial Load Rating-Static SCO used, remanufactured.

What is NC6004 bearing cross reference？