WIB ball bearings are manufactured according to the tolerance class DIN P0, P6 and P5 specifications. The accuracy class of the balls is grade 5. The following
The designations of most SKF rolling bearings follow a system that may -ZNR, Shield on one side, snap ring groove in the outer ring, snap ring on the opposite side of the shield P6, Dimensional and running accuracy to P6 tolerance class.
White Paper on bearing tolerance and precision levels including definitions and specifications of ABEC and RBEC precision levels . ABEC 3, Class 6, P6.
Regarding bearing accuracy classes, besides ISO normal accuracy, as . P6. P5. P4. P2. ⎯. ⎯. Ball. ABEC 1. ABEC 3. ABEC 5. ABEC 7. ABEC 9. A60. Bearings.