18S.25-6-A 1018 Carbon Steel Square Bar, Material Carbon Steel, Material Grade 1018, Thickness 0.25 in, Thickness Tolerance -0.003 in, Overall Length 6 in, Overall Width 1/4 in, Fabrication Cold Finished, Heat Treatable Yes, Heat Treatment No Heat Treatment, Mechanical Finish Mill, Yield Strength 54,000 psi, Tensile Strength 80,000 psi, Brinell Hardness 70, Rockwell Hardness Not Rated, Machinability 78 Percent, Standards ASTM A108, ASTM A29, Appearance Unpolished, Length Tolerance +0.125 in/-0 in