Thin Wall Plain Linear Bearing FMTC50 50mm Closed, CompensatedThin Wall Plain Linear Bearing with a compensated 50mm ID (inner diameter), featuring a self lubricating FrelonGOLD liner for maintenance free operation in harsh conditions like extreme temperatures, dirt and vibration. The compensated running clearance provides more clearance between the bearing interior and shaft allowing the bearing to perform like a linear ball bearing. Closed ISO Metric Only Compensated running clearance 0. 0015" per side