Machine Key Length 1 1/2 in Length Tolerance +0.000/-0.030 in Material Steel Material Grade/Class Grade 1018/Grade 1045 Finish Plain End Profile Square Width Tolerance +0.000/-0.002 in Head Height 1/4 in Key Type Undersized Tensile Strength 64 000 psi Standards ANSI B17.1 System of Measurement Inch Key Shape Straight Height 1/4 in Width 1/4 in Rockwell Hardness B50 Made in North America Yes Manufacturer Location Made in USA Pack Size Small Pack Package Quantity 10