D2 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 1/2 in Fabrication Hot Rolled Heat Treatable Yes Heat Treatment Air Hardened Mechanical Finish Precision Ground Yield Strength 65 000 psi Tensile Strength 103 000 psi Brinell Hardness 220 to 255 Rockwell Hardness C26 Standards AISI D-2 ASTM A681-08 FEDERAL QQT 570 REV C SAE J437 UNS T30402 Includes Material Certificate Yes