Carbon Steel Square Bar, Material Carbon Steel, Material Grade 1045, Thickness 2.5 in, Thickness Tolerance -0.006 in, Overall Length 6 in, Overall Width 2 1/2 in, Fabrication Cold Rolled, Heat Treatable Heat Treatable, Heat Treatment Case-Hardened, Mechanical Finish Polished, Yield Strength 77,000 psi, Tensile Strength 100,000 psi, Brinell Hardness 90 BHN, Rockwell Hardness 43 HRC, Machinability 64 Percent, Standards ASTM A108, ASTM A29