Tool Steel Rectangular Bar, Material Tool Steel, Material Grade D2, Thickness 0.25 in, Thickness Tolerance +/-0.001 in, Overall Length 36 in, Overall Width 3/4 in, Fabrication Hot Rolled, Heat Treatable Heat Treatable, Heat Treatment Air-Hardened, Mechanical Finish Precision Ground, Yield Strength 65,000 psi, Tensile Strength 103,000 psi, Brinell Hardness 220 BHN, Rockwell Hardness 26 HRC, Standards AISI D-2, ASTM A681-08, FEDERAL QQT 570 REV C, SAE J437, UNS T30402