Tool Steel Rod, Material Tool Steel, Material Grade S7, Overall Length 36 in, Heat Treatable Heat Treatable, Heat Treatment Air- or Oil-Hardened, Mechanical Finish Precision Ground, Outside Diameter 1 1/2 in, Outside Diameter Tolerance +/-0.001 in, Yield Strength 53,000 psi, Rockwell Hardness 90 HRB, Brinell Hardness 188 BHN, Tensile Strength 97,000 psi, Machinability Not Rated, Length Tolerance Not Rated, Includes Material Certificate Material Certificate with Lot Number