Form:

This specification covers an aluminum alloy in the form of extruded bars, rods, and profiles (shapes) produced with a cross sectional area of 24 square inches (155 cm²) maximum and a circumscribing circle diameter (circle size) of 10.5 inches (267 mm) maximum. See 8.3 for a definition of circumscribing circle diameter.

Application:

These extrusions have been used typically for machined parts requiring a combination of high mechanical properties and good resistance to exfoliation corrosion, but usage is not limited to such applications.