Hex Nut Hex Type Standard Hex Finish Black Oxide Material Grade/Class Grade 8 Material Steel Thread Size 5/8 In.-18 Hex Width 15/16 in Hex Height 35/64 in Manufacturer Location Globally Sourced Dimensional Standards ASME B18.2.2 System of Measurement Inch Thread Direction Right Hand Pack Size Small Pack Rockwell Hardness C33 to C39 Thread Type UNF/UNS Package Quantity 25