Tool Steel Rectangular Bar, Material Tool Steel, Material Grade S7, Thickness 0.25 in, Thickness Tolerance +0.015 in, Overall Length 36 in, Overall Width 1 1/2 in, Heat Treatable Heat Treatable, Heat Treatment Air-Hardened, Oil-Hardened, Mechanical Finish Precision Ground, Yield Strength 53,000 psi, Tensile Strength 97,000 psi, Brinell Hardness 188 BHN, Rockwell Hardness 90 HRB, Standards ASTM A681, SAE J437, Includes Material Certificate Material Certificate with Lot Number