Aluminum Etc.: What is military-grade aluminum?

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I am always grateful for the questions I get from readers. So I think now is a good time to share one of those questions and see if you have any personal insights or knowledge that can expand on my response or add to the reader’s question.

J. Cookson from Williamsburg, Va., sent me this:

“I am told that the Ford F-150 is a 4943 aluminum cab. And I have read that it is "military-grade" aluminum. Can you tell me what military grade means in this context? I am wondering if the military sponsored the research that resulted in this alloy, or does the 4943 aluminum have some magic ballistics resistance?”

Simply put, “military grade” is when a certain series of aluminum is used to make equipment specifically used in the military. That’s it. Alas, there is no ballistics resistance nor magic in 4943.

Over 100 years ago, the military found that switching from steel to aluminum made everything lighter and easier to transport. As to the military sponsoring the development of 4943, I was unable to find any resource that proves or disproves this point. Specifically, 4943 aluminums have approximately 25% higher tensile and shear strength than other alloys in the 4000 series.

The military quickly understood the implications of using aluminum in all their vehicles, body armor, and artillery, and embraced its use. The 5000 series aluminum is used to make all current vehicles because it increases the vehicle’s ability to maneuver through water, air, and land efficiently. Since the 5000 series aluminum is so light, larger transport can be arranged. Corrosion resistance properties also are a factor.

The 7000 series aluminum is used in body armor as well as artillery production. Its impact strength is very impressive and is said to be able to withstand a .50-caliber round. The use of aluminum in weaponry—everything from torpedoes, mines, guns, and launchers—has lowered production costs while maintaining or even enhancing performance.

In time, the automotive industry took its cue from the military and used aluminum in their builds and referred to their vehicles as military grade to promote how lightweight and durable they are.

I would love to hear from anyone with insider info about the use of aluminum in vehicles. I am also kind of hoping there is some “magic aluminum” being developed out there. Let me know.