Tool Steel Rectangular Bar, Material Tool Steel, Material Grade A2, Thickness 0.25 in, Thickness Tolerance +/-0.001 in, Overall Length 18 in, Overall Width 1 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 200 BHN, Rockwell Hardness 24 HRC, Standards AISI A-2, ASTM A681-08, FEDERAL QQT 570 REV C, SAE J437, UNS T30102