Product Code:SAE AMS4128 Title:Aluminum Alloy Bars, Rolled or Cold Finished 1.0Mg - 0.60SI - 0.30Cu - 0.20Cr (6061-T451) Solution Heat Treated and Stress Relieved by Stretching Issuing Committee:Ams D Nonferrous Alloys Committee Scope:This specification covers an aluminum alloy in the form of bars and rods 0.500 in. (12.50 mm) and over in nominal diameter or least distance between parallel sides.