Lock Nut Finish Plain Material Brass Material Grade/Class Not Graded Thread Size 5/16 In.-18 Hex Width 1/2 in Hex Height 1/4 in Lock Type Nylon Insert Dimensional Standards ASME B18.16.6 System of Measurement Inch Hex Type Standard Hex Thread Direction Right Hand Insert Material Nylon Pack Size Small Pack Resistance Properties Chemical Resistant Impact Resistant Temperature Resistant Vibration Resistant Rockwell Hardness - Package Quantity 25