This standard specifies the characteristics of single row self-aligning roller bearings in steel, cadium plated, designed to withstand only slow rotations, osciliations and/or swivelling under load. They are intended for use in bell crank lever ends or at the end of rigid flightcontrol rods for transmission puropses, before or after servo operation. The airframe rolling bearings defined in this standard are used form -54°C to +150°C.