... many designs,dimension series and size.The majority are single row bearings with a cage.Bearing with a cage can accommodate ... cylindrical roller beairngs comprises the basic types as following:Single row Cylindrical roller bearings ,caged,mainly of the NU,NJ,NUPand ... ,caged,mainly of the NNU and NN designs;Muti-row Cylindrical roller bearingsSingle row full complement roller bearings,mainly of the NCF ...