... ,Z3V3 2,High speed 3,End cover:ZZ,RS 4,Noise level:Z1,Z2 double row cylindrical roller bearing ... 1,ABEC-3,5;Z2V2,Z3V3 2,High speed 3,End cover:ZZ ... and dismounted. They are designed as types of single, double and multiple rows among which the single row cylindrical ... , deceleration devices, unloading and lifting machines and other industrial machines.