Carbon Steel Sheet, Material Carbon Steel, Material Grade A1011, Heat Treatable Not Heat Treatable, Heat Treatment Annealed, Mechanical Finish Mill, Overall Length 18 in, Overall Width 18 in, Thickness 0.135 in, Thickness Tolerance 0 in/-0.006 in, Yield Strength 36,000 psi, Fabrication Hot Rolled, Machinability Not Rated, Rockwell Hardness 75 HRB, Tensile Strength 58,000 psi, Length Tolerance +/-0.125 in, Width Tolerance +/-0.125 in, Standards ASTM A1011