T6 temper 6061 has been treated to provide the maximum precipitation hardening (and therefore maximum yield strength) for a 6061 aluminum alloy. It has an ultimate tensile strength of at least and yield strength of at least . More typical values are and , respectively. This can exceed the yield strength of certain types of stainless steel in comparison. In thicknesses of or less, it has elongation of 8% or more; in thicker sections, it has elongation of 10%. T651 temper has similar mechanical properties.