Carbon Steel Rod, Material Carbon Steel, Material Grade 1018, Overall Length 36 in, Heat Treatable Heat Treatable, Heat Treatment No Heat Treatment, Mechanical Finish Mill, Outside Diameter 3 1/2 in, Outside Diameter Tolerance 0 in/-0.004 in, Yield Strength 55,000 psi, Fabrication Cold Rolled, Rockwell Hardness Not Rated, Brinell Hardness 70 BHN, Tensile Strength 65,000 psi, Machinability 78 Percent, Length Tolerance +/-3 in, Includes Material Certificate Material Certificate with Lot Number