D2 Tool Steel Rod, Material Tool Steel, Material Grade D2, Overall Length 6 ft, Heat Treatable Yes, Heat Treatment Air Hardened, Mechanical Finish Mill, Outside Diameter 5/8 in, Outside Diameter Tolerance +.01/+.032, Yield Strength 50,000 psi, Fabrication Hot Rolled, Rockwell Hardness C60 to C62, Brinell Hardness 217 to 255, Tensile Strength Not Rated, Machinability 27 Percent, Length Tolerance +/-6.00 in, Includes Material Certificate Yes, Standards ASTM A681, DIN 1.2379, SAE J437, SAE J438