Tool Steel Rod, Material Tool Steel, Material Grade D2, Overall Length 6 in, Heat Treatable Heat Treatable, Heat Treatment Air-Hardened, Mechanical Finish Mill, Outside Diameter 5 1/2 in, Outside Diameter Tolerance +0.01 in/+0.093 in, Yield Strength 50,000 psi, Fabrication Hot Rolled, Rockwell Hardness 60 HRC, Brinell Hardness 217 BHN, Tensile Strength Not Rated, Machinability 27 Percent, Length Tolerance +0.125 in/0 in, Includes Material Certificate Material Certificate with Lot Number