Tool Steel Rod, Material Tool Steel, Material Grade O1, Overall Length 36 in, Heat Treatable Heat Treatable, Heat Treatment Oil-Hardened, Mechanical Finish Precision Ground, Outside Diameter 1 13/64 in, Outside Diameter Tolerance +/-0.001 in, Yield Strength 58,000 psi, Rockwell Hardness 88 HRB, Brinell Hardness 177 BHN, Tensile Strength 105,000 psi, Machinability 95 Percent, Length Tolerance Not Rated, Includes Material Certificate Material Certificate with Lot Number