The aluminum sheet 6061 alloy is strong, easily machined, and weldable. Aluminum 6061 alloys are doubled the strength of aluminum 6063 alloys. Aluminum 6061 has an ultimate tensile strength of at least 42,000 psi (290 MPa) and yield strength of at least 35,000 psi (241 MPa). In thicknesses of 0.250 inch (6.35 mm) or less, it has elongation of 8% or more; in thicker sections, it has elongation of 10%. T651 temper has similar mechanical properties. The famous Pioneer plaque was made of this particular alloy. 

Thickness (C) X Width (B) X Length (A)