This specification covers sealed, self-aligning, anti-friction, rod end roller bearings operating in the temperature range of −65 to +300 °F (−54 to +149 °C) and intermittent spikes to 350 °F (177 °C).

Classification:

Bearings shall be of the following types, as specified (see 6.2):

Type I External thread rod end bearings (AS21221, AS21223, AS21429)

Type II Internal thread rod end bearings (AS21220)