Alloy Steel Rectangular Bar, Material Alloy Steel, Material Grade 4142, Thickness 0.3125 in, Thickness Tolerance +/-0.001 in, Overall Length 36 in, Overall Width 1 1/2 in, Fabrication Hot Rolled, Heat Treatable Heat Treatable, Heat Treatment Pre-Hardened, Mechanical Finish Mill, Yield Strength Not Rated, Tensile Strength Not Rated, Brinell Hardness 187, Rockwell Hardness 94 HRB, Machinability 50 Percent, Standards ASTM A322, Appearance Metallic