Round Flanged Plain Linear Bearing SFPJR80 80mm JISJIS metric round flanged plain linear bearing with a 20mm ID, a precision round shaft running clearance, and a standard size aluminum housing with an inserted self aligning linear bearing featuring a self lubricating Simplicity FrelonGOLD liner. Unlike recirculating ball bearings, the 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