Lock Nut Finish Black Oxide Material Steel Material Grade/Class Grade 8 Thread Size 9/16 In.-18 Hex Width 7/8 in Hex Height 41/64 in Lock Type Nylon Insert Dimensional Standards ASME B18.16.6 System of Measurement Inch Hex Type Standard Hex Thread Direction Right Hand Pack Size Small Pack Rockwell Hardness C24 to C32 Package Quantity 25