WHAT ARE THE DIFFERENCES BETWEEN ALUMINUM 6063-T5 AND 6060-T66 Aluminum 6063-T5 and 6060-T66 are both aluminum alloys, but they have distinct differences in composition, mechanical properties, and typical applications. Here's a detailed comparison: COMPOSITION Aluminum 6063-T5: This alloy primarily consists of aluminum, with magnesium and silicon as its major alloying elements. It also contains smaller amounts of iron, copper, manganese, chromium, zinc, and titanium. Aluminum 6060-T66: This alloy is similar to 6063 but typically has slightly different proportions of magnesium and silicon, optimizing it for certain properties such as extrudability and surface finish. WDMA