4140 Alloy Steel Rectangular Bar, Material Alloy Steel, Material Grade 4140, Thickness 0.5 in, Thickness Tolerance +/-0.002 in, Overall Length 11.75 in, Overall Width 4 in, Fabrication Hot Rolled, Heat Treatable Yes, Mechanical Finish Precision Ground, Yield Strength 127,000 psi, Tensile Strength 148,000 psi, Brinell Hardness 197, Rockwell Hardness C26 to C32, Machinability Not Rated, Standards DFARS Compliant, Appearance Mill, Includes Material Certificate Yes, Length Tolerance +/-0.002 in