Die Set Plain Linear Bearing - Aluminum PACMZ40C 40mm Compensated IDDie set plain linear bearing with an aluminum shell, a 40mm 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 (use stainless steel shafts for this) and FrelonW is offered as