Plain Linear Bearing CFPM40C 40mm ID - Square Flange Center, Double Wide, Compensated IDDouble plain linear bearing, 40mm ID, square center flange, compensated running clearance. This Simplicity bearing uses a self lubricating FrelonGOLD liner bonded directly to the bore of a sturdy aluminum body, without a separate bearing insert. The result is maintenance free, oil free sliding performance in extreme conditions such as heat, dirt, and vibration, where ball bearings often fail. The double size is equivalent to two standard sized