... level: reach the same level as the Japanese and European bearings 3) Tolerance level: ABEC-1 (P0), ABEC-3 ... components, pumps,machinery.Bearing ClearanceThe radial paly of NBK bearings might be divided into five groups according to ISO ... 3630 5145 73Shield,seal and lubrication The structure of bearings consists of open and close types,and the close ... 8 4 2 inner ring Deep Groove Ball Bearings 6000 series