Carbon Steel Rectangular Bar, Material Carbon Steel, Material Grade 1018, Thickness 0.38 in, Thickness Tolerance 0 in/-0.006 in, Overall Length 6 in, Overall Width 3 1/4 in, Fabrication Cold Rolled, Heat Treatable Heat Treatable, Heat Treatment Case-Hardened, Mechanical Finish Polished, Yield Strength 54,000 psi, Tensile Strength 80,000 psi, Brinell Hardness 70 BHN, Rockwell Hardness 39 HRC, Machinability 78 Percent, Standards ASTM A108, ASTM A29