Plain Linear Bearing - Square Flanged SFPM25 25mm Precision IDSquare flanged plain linear bearing with a 25mm ID, a precision running clearance, and a standard size aluminum housing featuring a self lubricating Simplicity FrelonGOLD liner bonded directly to the bore of the housing. Unlike recirculating ball bearings, the FrelonGOLD sliding surface has no rolling elements to jam, seize, or contaminate, making it well suited for harsh conditions involving extreme heat, dirt, vibration, shock, or washdown exposure.