4140 Alloy Steel Rod Material Alloy Steel Material Grade 4140 Overall Length 36 in Heat Treatable Yes Heat Treatment Tempered Mechanical Finish Mill Outside Diameter 1 3/4 in Outside Diameter Tolerance +0.0000 in/-0.0015 in Yield Strength 105 000 psi Fabrication Cold Finished Rockwell Hardness Not Rated Brinell Hardness 321 Machinability Not Rated Tensile Strength 125 000 psi Includes Material Certificate No Standards AISI 4140 ASTM A108 ASTM A193 B7 ASTM A29 UNS G41400