This standard specifies the characteristics of rigid single row ball bearings in steel, with cadmium-plated flanged alignment housing designed to withstand only slow rotations and oscillations under load.They are intended for use in the hubs of torsion lever and in separated supports for airframe/aerospace applications.The airframe rolling bearings defined in this standard may be used in the temperature range from - 54 °C to 150 °C.However, being lubricated with the following greases (see EN 3727):ester type very high pressure grease (code letter A), operating range from - 73 °C to 121 °C or,synthetic hydrocarbons type very high pressure grease general purpose (code letter B) operating range from - 54 °C to 177 °C.Their field of application when lubricated with code letter A grease is limited to 121 °C.