✅ Square, Al, 6061, 1 3/4 x 1 3/4 In, 1 Ft, Mfr: 61S1.75-12-A ✅ Thickness: 1.75 in ✅ Width: 1-3/4" ✅ Alloy Type: 6061 ✅ Material: Aluminum 61S1.75-12-A Flat Bar Stock, Aluminum, 6061, T6511, Sheet, 12 in Overall Length, Length Tolerance +/-1.000 in, 1 3/4 in Overall Width, Width Tolerance +/-0.014 in, 1.75 in Thickness, Thickness Tolerance +/-0.014 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 ASTM B221, AMS QQ-A-200/3