Lock Nut Finish Zinc Plated Material Steel Material Grade/Class Grade A Thread Size 5/16 In.-18 Hex Width 1/2 in Hex Height 9/32 in Lock Type Serrated Dimensional Standards ASME B18.16.4 System of Measurement Inch Hex Type Flange Hex Thread Direction Right Hand Flange Diameter 0.68 in Pack Size Small Pack Package Quantity 100