Flat Bar Stock, Aluminum, 6061, T651, Sheet, 6 in Overall Length, Length Tolerance +0.125/-0 in, 6 in Overall Width, Width Tolerance +0.125/-0 in, 0.25 in Thickness, Thickness Tolerance +0.014/-0 in, Fabrication Cold Finished, Heat Treatment Tempered, Heat Treatable Yes, Mechanical Finish Mill, Yield Strength 40,000 psi, Tensile Strength 45,000 psi, 95 Brinell Hardness, B95 Rockwell Hardness, Standards AMS 4027, AMS QQ-A-250, ASTM B209, Minimum Temperature -320 Degrees F