Alloy Steel Rod, Material Alloy Steel, Material Grade 4140, Overall Length 6 ft, Heat Treatable Heat Treatable, Heat Treatment Tempered, Mechanical Finish Mill, Outside Diameter 1 5/8 in, Outside Diameter Tolerance 0 in/-0.007 in, Yield Strength 105,000 psi, Fabrication Cold Rolled, Rockwell Hardness Not Rated, Brinell Hardness 241 BHN, Machinability Not Rated, Tensile Strength 125,000 psi, Includes Material Certificate No Certificates Included .