DS EN 3288:1994 Aerospace Series - Bearings, Airframe Rolling - Double Row Self-Aligning Ball Bearings In Steel, Cadmium Plated - Diameter Series 2 - Dimensions And Loads Defines the characteristics of double row self-aligning ball bearings in steel, cadmium plated, of diameter series designed to withstand only slow rotations, oscillations and/or swivelling under load.