61F.25X6-36-A Flat Bar Stock, Aluminum, 6061, T6511, Bar, 36 in Overall Length, Length Tolerance +/-3.000 in, 6 in Overall Width, Width Tolerance +/-0.044 in, 0.25 in Thickness, Thickness Tolerance +/-0.008 in, Fabrication Extruded, Heat Treatment Pre-Hardened, Heat Treatable Yes, Mechanical Finish Mill, Yield Strength 40,000 psi, Tensile Strength 45,000 psi, 95 Brinell Hardness, B95 Rockwell Hardness, Includes Material Certificate Yes, Standards AMS-QQ-A-200, ASTM B221, Minimum Temperature -320 Degrees F