1009 Carbon Steel Square Tread Plate, Material Carbon Steel, Material Grade 1009, Thickness 1/4 in, Thickness Tolerance +/-0.017 in, Heat Treatable Yes, Heat Treatment No Heat Treatment, Overall Length 12 in, Overall Width 12 in, Mechanical Finish Mill, Tensile Strength 60,000 psi, Yield Strength 33,000 psi, Brinell Hardness 149, Machinability Not Rated, Texture Diamond, Shape Square Tread Plate, Standards ASTM A786, Length Tolerance +/-0.125 in, System of Measurement Inch