Plain Linear Bearing - Square Flanged SFPM40 40mm Precision IDSquare flanged plain linear bearing with a 40mm ID. A precision running clearance provides a closer fit between the shaft and bearing for smooth, accurate motion in applications where reduced play is desired. The FrelonGOLD liner, bonded to the bore of the lightweight, durable flanged aluminum housing, ensures maintenance free performance in harsh conditions such as dirt, vibration, and extreme temperatures. This standard sized Simplicity bearing