1018 Carbon Steel Hex Bar Material Carbon Steel Material Grade 1018 Fabrication Cold Finished Heat Treatable Yes Heat Treatment No Heat Treatment Hex Width 1 5/8 in Mechanical Finish Mill Overall Length 36 in Rockwell Hardness Not Rated Brinell Hardness 70 Tensile Strength Not Rated Yield Strength 54 000 psi Machinability 78 Percent Standards ASTM A108 ASTM A29 Shape Hex Bar Appearance Unpolished Length Tolerance +/-3 in Straightness Tolerance Not Rated