Aluminum Alloy, Extrusion 2.7Cu - 1.8Li - 0.7Zn - 0.3Mn - 0.3Mg - 0.08Zr (2099-T83) Solution Heat Treated, Stress Relieved by Stretching 1 to 4% and Aged AMS4287B

This specification covers an aluminum alloy in the form of extruded bars, rods, and profiles (shapes) produced with nominal thickness up to 3.000 inch (76.20 mm), inclusive, and having a cross sectional area of 42 square inches (271 square centimeters) maximum and a circumscribing circle diameter (circle size) of 15 inches (38 cm) maximum (see 8.9). See 8.3 for definition of circumscribing circle size.