55 mm x 140 mm x 33 mm KOYO NU411 cylindrical roller bearings

55 mm x 140 mm x 33 mm KOYO NU411 cylindrical roller bearings AST BEARING OF AMERICA CORP. Manufacturers , Online Wholesale 55 mm x 140 mm x 33 mm Suppliers‎ ! Ball Bearing Rolling Element

What is NU411 bearing interchange？