This standard specifies boundary dimensions of double row angular contact ball bearings with filling slot and without filling slot, double-row angular contact ball bearings with shield at one side and shields at both sides, double row angular contact ball bearings with seal ring at one side and seal rings at both sides and double row angular contact ball bearings with double inner rings that conform to those specified in GB 273.3 "Rolling Bearings—Radial Bearings—Boundary Dimensions".
This standard is applicable to double row angular contact ball bearings.