1045 Carbon Steel Square Bar Material Carbon Steel Material Grade 1045 Thickness 1.125 in Thickness Tolerance -0.005 in Overall Length 36 in Overall Width 1 1/8 in Fabrication Cold Finished Heat Treatable Yes Heat Treatment Flame or Induction Hardened Mechanical Finish Polished Yield Strength 77 000 psi Tensile Strength 100 000 psi Brinell Hardness 90 Rockwell Hardness Not Rated Machinability 64 Percent Standards ASTM A108 ASTM A29 Shape Square Bar System of Measurement Inch