... ,End cover:ZZ,RS 4,Noise level:Z1,Z2 double row cylindrical roller bearing 1,ABEC-3,5;Z2V2,Z3V3 2,High ... 4,Noise level:Z1,Z2 double row cylindrical roller bearing is in line contact with the raceway, so the bearing can bear heavier radial ... are designed as types of single, double and multiple rows among which the single row cylindrical roller bearings are most applicable. Normally these ...