1018 Carbon Steel Hex Bar Material Carbon Steel Material Grade 1018 Fabrication Cold Finished Heat Treatable Yes Heat Treatment No Heat Treatment Hex Width 2 1/2 in Mechanical Finish Mill Overall Length 36 in Rockwell Hardness Not Rated Brinell Hardness 70 Tensile Strength 65 000 psi Yield Strength 55 000 psi Machinability 78 Percent Standards ASTM A108 ASTM A29 Shape Hex Bar Appearance Unpolished Length Tolerance +/-3 in System of Measurement Inch Tolerance Rating Standard