12L14 Carbon Steel Hex Bar Material Carbon Steel Material Grade 12L14 Fabrication Cold Finished Heat Treatable Yes Heat Treatment No Heat Treatment Hex Width 5/16 in Mechanical Finish Mill Overall Length 12 in Rockwell Hardness Not Rated Brinell Hardness 85 Tensile Strength 78 000 psi Yield Strength 60 000 psi Machinability 193 Percent Standards ASTM A108 ASTM A29 Shape Hex Bar Appearance Unpolished Length Tolerance +/-1 in System of Measurement Inch Tolerance Rating Standard