Tool Steel Rectangular Bar, Material Tool Steel, Material Grade A2, Thickness 0.625 in, Thickness Tolerance +0.015 in, Overall Length 18 in, Overall Width 2 in, Heat Treatable Heat Treatable, Heat Treatment Air-Hardened, Mechanical Finish Precision Ground, Yield Strength 50,000 psi, Tensile Strength 100,000 psi, Brinell Hardness 200 BHN, Rockwell Hardness 94 HRB, Standards ASTM A681, SAE J437, Includes Material Certificate Material Certificate with Lot Number, Length Tolerance +0.125 in/+0.25 in