... NN serires cylindrical roller bearing Suitable for principal axis of machine tool Grade: P2, p4, p5, p6, ISO9001 & IQNET 1. NN serires bearing for principal ... axis bearing for machine tool2. Grade: P2, p4, p5, p6, ... W33NN3052NN3052K/W33NN3056NN3056K/W33NN3060NN3060K/W33NN3064NN3064K/W33 high-quality Double row ylindrical roller bearing