The designations of most SKF rolling bearings follow a system that may consist of a basic P6, Dimensional and running accuracy to P6 tolerance class.
Dimensional and geometrical tolerances in accordance with P6 tolerance class. P43 2RZ, RZ low-friction non-contact seal, on both sides of the bearing. S.
Cylindrical roller bearings, single row. Tolerances: Normal (metric), P6, Normal (inch) · Radial internal clearance: cylindrical bore, tapered bore · Axial internal
White Paper on bearing tolerance and precision levels including definitions and specifications of ABEC and RBEC precision levels . ABEC 3, Class 6, P6.