4142 Alloy Steel Rectangular Bar Material Alloy Steel Material Grade 4142 Thickness 0.5 in Thickness Tolerance +0.010 in/-0.045 in Overall Length 36 in Overall Width 1 in Fabrication Hot Rolled Heat Treatable Yes Heat Treatment Pre-Hardened Yield Strength 93 000 psi Tensile Strength Not Rated Brinell Hardness 261 Rockwell Hardness C28 to C32 Machinability 63 Percent Standards ASTM A322 Length Tolerance +/-3 in Maximum Temperature 1 000 Degrees F Shape Rectangular Bar