Alloy Steel Plate, Material Alloy Steel, Material Grade 4340, Heat Treatable Heat Treatable, Heat Treatment Annealed, Mechanical Finish Mill, Overall Length 4 ft, Overall Width 12 in, Thickness 1 in, Thickness Tolerance +0.06 in/-0.01 in, Yield Strength 68,000 psi, Fabrication Hot Rolled, Rockwell Hardness 95 HRB, Machinability 50 Percent, Tensile Strength 108,000 psi, Length Tolerance Not Rated, Width Tolerance Not Rated, Standards AMS 6359, ASTM A829