Key Stock System of Measurement Inch Material Steel Material Grade/Class Grade 1018/Grade 1045 Finish Plain Height 1/4 in Thickness Tolerance +0.000/-0.002 in Length 6 ft Length Tolerance +/-0.250 in Width 1/4 in Width Tolerance +0.000/-0.002 in Pack Size Small Pack Made in North America Yes Key Shape Straight Rockwell Hardness HRB 50 Features - Tensile Strength 70 000 psi Manufacturer Location Made in USA Key Type Undersized