Type: This procurement specification covers aircraft quality retaining rings of the spiral wound type with uniform rectangular cross-sections and made from a corrosion resistant austenitic iron base alloy of the type identified under the Unified Numbering System as UNS S30200@ and of spring temper condition. Classification: Retaining rings shall conform to one of the following type and classes: a. Type I ?C External Ring@ Class 1@ Medium Duty b. Type I ?C External Ring@ Class 2@ Heavy Duty c. Type II ?C Internal Ring@ Class 1@ Medium Duty d. Type II ?C Internal Ring@ Class 2@ Heavy Duty Application: Intended for use on aerospace propulsion systems for retaining parts on shafts and in housing bores where extended temperature use is not greater than 400 ??