Die Set Plain Linear Bearing - Aluminum PACMZ50C 50mm Compensated IDDie set plain linear bearing with an aluminum shell, a 50mm ID and a compensated running clearance of 0. 0015 per side in a closed, standard width design. Features a round flange and self lubricating FrelonGOLD liner as standard, which provides optimal performance in extreme conditions such as dirt, heat and vibration. An optional FrelonJ liner is available for harsh chemical environments and FrelonW is offered as an FDA compliant liner option. Closed