This specification has been declared "CANCELLED" by the Aerospace Materials Division, SAE, as of January 2012 and has been superseded by SAE AMS 4154. The requirements of the latest issue of SAE AMS 4154 shall be fulfilled whenever reference is made to the cancelled AMS 4168. By this action, this document will remain listed in the Numerical Section of the Index of Aerospace Materials Specifications, noting that it has been superseded by SAE AMS 4154.

This specification covers an aluminum alloy in the form of extruded bars, rods, wire, profiles, and tubing.

These products have been used typically for parts subject to excessive warpage during machining and for parts requiring high strength and whose fabrication does not involve welding or forming, but usage is not limited to such applications.

Certain design and processing procedures may cause these extrusions to become susceptible to stress-corrosion cracking; SAE ARP 823 recommends practices to minimize such conditions.