Thin Wall Linear Bearing - FAG Interchange FGC40 40mm Plain, Closed, CompensatedThin Wall Plain Linear Bearing with a compensated 40mm ID (inner diameter). The compensated running clearance provides more clearance between the inner diameter and shaft allowing the bearing to perform like a linear ball bearing. ISO Metric Closed Compensated running clearance, 0. 0015" per side Straight outer diameter Self Lubricating Simplicity Frelon Gold liner material with Aluminum outer shell Designed for use with end supported shafting FAG