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This document specifies the characteristics of spherical plain bearings, metal to metal, in corrosion resisting steel, passivated, wide series, inch series for aerospace applications. They are intended for use in fixed or moving parts of the aircraft structure and their control mechanisms. They are used in the temperature range -54 °C to 150 °C. As they are lubricated by means of the following greases: Code A: Grease as per MIL-PRF-23827C, operating temperature range -73 °C to 121 °C. Code B: Grease as per MIL-PRF-81322G, operating temperature range -54 °C to 177 °C. The range of application for bearings lubricated with grease per code A is limited to 121 °C. In both cases it is important to provide the spherical surface of the outer or inner ring with a dry-film lubricant as per MIL-PRF-46010G or equivalent (anti-seizing protection). The slide hole treatment either at the outer ring or inner ring.