This specification covers an aluminum alloy in the form of die forgings or hand forgings up to 5 inches (125 mm) in thickness, and forging stock of any size (see 8.7).
This specification covers an aluminum alloy in the form of die forgings up to 4 inches in nominal thickness, hand forgings up to 8 inches in nominal thickness, rolled rings up to 3 inches in nominal thickness, and forging stock (see 8.6).
This specification covers an aluminum alloy in the form of die forgings and hand forgings up to 6.000 inches (152.40 mm) in nominal thickness at the time of heat treatment (see 8.4).
This specification covers an aluminum alloy in the form of die and hand forgings 6.000 inches (152.00 mm) and under in nominal thickness at time of heat treatment (see 8.6).
This specification covers an aluminum alloy in the form of die forgings and hand forgings procured to metric (SI) units. AMS 4131 is the inch/pound verison of this MAM. These forgings have been used typically for parts requiring a combination of good strength and resistance to stress-corrosion cracking, but usage is not limited to such applications.