... .C0,C2,C3,C4 4.widely used Cylindrical roller bearing 1.GCr15, Gcr15SiMn 2.ISO 9001:2000 3 ... NJ NUP and N designs double row cylindrical roller bearings ,caged,mainly of the NNU and NN ... and NJG designs double row full complement cylindrical roller bearing bearings,mainly of the NNF design multi-row ... full complement cylindrical roller bearings, with four or eight rows of rollers ...