Carbon Steel Square Bar, Material Carbon Steel, Material Grade 1045, Thickness 0.875 in, Thickness Tolerance -0.005 in, Overall Length 6 ft, Overall Width 7/8 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