This specification covers all metal plain spherical bearings which are self-aligning for use between 65 ??to 250 ?? This specification covers bearings with alloy steel races@ aluminum bronze races@ and an entierly CRES bearing (ball and race). All units are inches@ unless otherwise stated. Purpose This document defines the procurment@ performance@ testing@ and procurement activity for the bearings defined in AS21154 and AS21155. Classification: Bearings shall be of the following types@ as specified: Type 1 ?C Grooved outer race (AS21154) Type 2 ?C Chamfered outer race (AS21155)