Alloy Steel Plate, Material Alloy Steel, Material Grade 4130, Heat Treatable Heat Treatable, Heat Treatment Air-Hardened, Mechanical Finish Mill, Overall Length 12 in, Overall Width 12 in, Thickness 0.25 in, Thickness Tolerance +0.03 in/-0.01 in, Yield Strength 63,000 psi, Fabrication Cold Rolled, Rockwell Hardness 92 HRB, Machinability 70 Percent, Tensile Strength 97,000 psi, Length Tolerance Not Rated, Width Tolerance Not Rated, Standards AMS 6350, AMS 6370, AMS S6758, MIL T6736