X(Cone/Inner Race And Cup/Outer Race) The Suffix 'X' Has Two Meanings: 1) Special Feature Bearing (Non-Interchangeable With Bearings Having The Same Basic Part Number). 2) ISO Bearing With Same Boundary Dimensions As Basic Part Number But With Different Internal Geometry, Yielding Increased Rating
30000(Cone/Inner Race And Cup/Outer Race) Same As PREC.3 (Precision Class 3)
