Form This specification covers an aluminum alloy in the form of sheet and plate 0.020 to 2.000 inches (0.51 to 50.80 mm)@ inclusive@ in nominal thickness@ supplied in the annealed (O) condition (see 8.4). When specified@ product shall be supplied in the ??as fabricated?? (F) temper. Application These products have been used typically for parts requiring high strength up to 500??(260?? after heat treatment@ but usage is not limited to such applications. May be welded and formed in the specified condition but properties are improved by heat treatment.