Carbon Steel Plate, Material Carbon Steel, Material Grade 1018, Heat Treatable Heat Treatable, Heat Treatment Case-Hardened, Mechanical Finish Polished, Overall Length 6 in, Overall Width 6 in, Thickness 1.13 in, Thickness Tolerance 0 in/-0.008 in, Yield Strength 54,000 psi, Fabrication Cold Rolled, Machinability 78 Percent, Rockwell Hardness 39 HRC, Tensile Strength 80,000 psi, Length Tolerance +/-0.125 in, Width Tolerance 0 in/-0.008 in, Standards ASTM A108, ASTM A29