Alloy Steel Rod, Material Alloy Steel, Material Grade 4130, Overall Length 36 in, Heat Treatable Heat Treatable, Heat Treatment Air-Hardened, Mechanical Finish Mill, Outside Diameter 2 1/2 in, Outside Diameter Tolerance +/-0.005 in, Yield Strength 63,000 psi, Fabrication Cold Rolled, Rockwell Hardness 92 HRB, Brinell Hardness 197 BHN, Machinability Not Rated, Tensile Strength 97,000 psi, Includes Material Certificate Material Certificate with Lot Number