90 mm x 225 mm x 54 mm ISB 6418 deep groove ball bearings

Various No Internal Symbol deep groove ball bearings types and NTN BEARING CORP.OF AMERICA sizes to accommodate your 90 mm x 225 mm x 54 mm 90 mm x 225 mm x 54 mm ISB 6418 deep groove ball bearings requirements. No Precision Grade Symbol

What is 6418 bearing cross reference？