Alloy Steel Rectangular Bar, Material Alloy Steel, Material Grade 4130, Thickness 0.16 in, Thickness Tolerance +/-0.009 in, Overall Length 12 in, Overall Width 6 in, Fabrication Cold Rolled, Heat Treatable Heat Treatable, Heat Treatment Annealed, Mechanical Finish Mill, Yield Strength 67,000 psi, Tensile Strength 81,000 psi, Brinell Hardness 156 BHN, Rockwell Hardness 82 HRB, Machinability 70 Percent, Standards AMS 6350, AMS 6351, ASTM A505