... reach the same level as the Japanese and European bearings 3) Tolerance level: ABEC-1 (P0), ABEC ... pumps,machinery.Bearing ClearanceThe radial paly of NBK bearings might be divided into five groups according to ... 5145 73Shield,seal and lubrication The structure of bearings consists of open and close types,and ... side or both sides (RS,2RS). Our bearings are alreaby filled with proper oil grease, whitch ...