The basic design of standard production about SKF double row angular contact ball bearings with a normal level tolerance(radial tolerance of inner ring，outer ring ). SKF explorer bearings and bearing 33 DNRCBM series are produced to tolerance specifications of P6-class .

The outer ring of drawings bearing model are also produced to normal level tolerance. Inner dimensional accuracy and running accuracy in line with tolerance level P6 or P5 . Running accuracy is always in line with a minimum tolerance level P6.

Tolerance values correspond with the standard of ISO 492:2002 .