4140 Alloy Steel Rod Material Alloy Steel Material Grade 4140 Overall Length 36 in Heat Treatable Yes Heat Treatment Annealed Mechanical Finish Mill Outside Diameter 7/16 in Outside Diameter Tolerance +0.000 in/-0.003 in Yield Strength 60 000 psi Fabrication Cold Finished Rockwell Hardness C10 Brinell Hardness 187 Machinability 66 Percent Tensile Strength 114 000 psi Includes Material Certificate Yes Standards ASTM A108 ASTM A29 Length Tolerance +/-3.000 in Shape Rod