Tool Steel Rod, Material Tool Steel, Material Grade W1, Overall Length 36 in, Heat Treatable Heat Treatable, Heat Treatment Water-Hardened, Mechanical Finish Precision Ground, Outside Diameter 45/64 in, Outside Diameter Tolerance +/-0.001 in, Yield Strength 48,000 psi, Rockwell Hardness 91 HRB, Brinell Hardness 190 BHN, Tensile Strength 86,000 psi, Machinability Not Rated, Length Tolerance Not Rated, Includes Material Certificate Material Certificate with Lot Number