DS EN 4033:2007 Aerospace Series - Bearings, Airframe Rolling - Rigid Single Row Ball Bearings In Corrosion Resisting Steel - Diameter Series 8 And 9, Reduced Internal Radial Clearance - Dimensions And Loads Defines the characteristics of rigid single row ball bearings, in corrosion resisting steel, reduced internal radial clearance, diameter series 8 and 9, designed to withstand only slow rotations and o