Lock Nut Finish Plain Hex Height 21/64 in Hex Type External Tooth Lock Washer Hex Width 1/2 in Lock Type Lock Nut with External Tooth Lock Washer Material Stainless Steel Material Grade/Class 18-8 Pack Size Small Pack Rockwell Hardness B68-C32 System of Measurement Inch Thread Direction Right Hand Thread Size 5/16 In.-18 Package Quantity 25