A bearing is a machine element that constrains relative motion to only the desired motion, and reduces friction between moving parts. The design of the bearing may, for example, provide for free linear 55x140x33 Bearing movement of the moving part or for free rotation around a fixed axis; or, it may prevent a motion by controlling the vectors of normal forces that bear on the moving parts. 

SKF ball bearing units with NSK 6304du Bearing composite housings . Ball bearing units for high temperature applications . Roller bearing units . Metric roller bearing units - SYNT and FYNT series (SKF ConCentra) Inch roller bearing units - SYE, SYR, FYE and FYR series . SKF Cooper split bearings.