Track rollers have outer rings with crowned or cylindrical outer surface, inner rings and ball and cage assemblies with plastic cages. Replacement markings for track rollers: 2RS = NPPU = sealing washer on both sides, crowned outer shell, 2Z = KDDU = metal washer on both sides, crowned outer shell, X-2RSR = NPP = sealing washer on both sides, cylindrical outer shell, X-2Z = KDD = metal washer on both sides, cylindrical outer shell. (for larger quantities please contact us)












