Aluminum Square Bar, Aluminum, 6061, T6511, Square, 6 ft Overall Length, Length Tolerance +0.125 in/0 in, 1/4 in Overall Width, Width Tolerance +/-0.008 in, 0.25 in Thickness, Thickness Tolerance +/-0.008 in, Fabrication Extruded, Heat Treatment Tempered, Heat Treatable Heat Treatable, Mechanical Finish Mill, Yield Strength 40,000 psi, Tensile Strength 42,000 psi, 93 BHN Brinell Hardness, 60 Rockwell Hardness, Includes Material Certificate Material Certificate with Lot Number