1144 Carbon Steel Rod, Material Carbon Steel, Material Grade 1144, Overall Length 6 ft, Heat Treatable Yes, Heat Treatment Stress Relieved, Mechanical Finish Mill, Outside Diameter 5/16 in, Outside Diameter Tolerance +0.0000 in/-0.0020 in, Yield Strength 100,000 psi, Fabrication Cold Finished, Rockwell Hardness C25, Brinell Hardness 253, Tensile Strength 115,000 psi, Machinability 83 Percent, Length Tolerance +/-6.000 in, Includes Material Certificate Yes, Standards ASTM A108, ASTM A311 Class B