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6061 and 6063 are the two most popular extrusion alloys. 6063 aluminum occupies the number one spot and 6061 occupies spot number two. As alloys in the 6000 series, they both have magnesium and silicon as their primary alloying elements. Thus, they have many similar properties. 6061 offers higher strength, however. As such, it is often used for more structural applications. 6063, on the other hand, is used for applications such as railing or trim, windows, and doors where strength is less of a factor in the decision-making process. 6061 Strength is Medium to High, good corrosive resistance, weldability, workability & machinability is also considered good. T6 is Solution heat-treated and artificially aged. T451 is solution heat-treated, stress relieved, then naturally aged. T651 is solution heat-treated, stress relieved by stretching and then naturally aged. T6511 is solution heat-treated, stress relieved by stretching and then artificially aged with minor straightening.