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6

Technical Services

Heat Treatable & Non-Heat Treatable Base & Fillers

Aluminum Alloy Designation Tree

The Aluminum Association uses a four digit numbering system for designating wrought aluminum and wrought aluminum alloys.

The image above shows the wrought alloy groups as well as a few examples of common products from each group.

The significance of each number is described below.

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1st Digit – Identifies the major alloying element.

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2nd Digit – Identifies the rendition of an alloy. For example, 5356 is the 3rd rendition of the original base alloy 5056.

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3rd and 4th Digits:

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In the 1XXX group, the last two digits indicate the minimum aluminum percentage. For example, alloy 1188

has a minimum purity of 99.88% aluminum. Alloy 1350 has a minimum purity of 99.50% aluminum.

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In the 2XXX – 8XXX groups, the last two digits serve merely as counters. For example, 3004 was the next

manganese alloyed chemistry after 3003.