Form: This specification covers an aluminium alloy in the form of rolled or forged rings. Application: Primarily for structural applications requiring a combination of high strength@ resistance to stress-corrosion cracking@ and good stability during machining. Classifications: Rings covered by this specification are classified by type of mechanical stress relief as follows: Type 1 - Stress-relieved by stretching (7075-T7351) Type 2 - Stress-relieved by compression (7075-T7352) Either type may be supplied@ unless a specific type is ordered.