The design of SKF double row angular contact ball bearings corresponds to two single row angular contact ball bearings arranged back-to-back.
The SKF standard assortment of double row angular contact ball bearings includes:
bearings in the 32 A and 33 A series
bearings in the 33 D series
open bearings (that are also available capped) that may have recesses in the ring side faces
Bearings in the 52 and 53 series are no longer available and have been replaced with 32 A and 33 A series bearings, which are dimensionally interchangeable. Only size 3200 A is different, and has a width of 14 mm instead of 14,3 mm.