Lock Nut Finish Plain Hex Height 21/64 in Hex Type Standard Hex Top Lock Hex Width 1/2 in Lock Type Top Lock Distorted Thread Material Stainless Steel Material Grade/Class 18-8 Pack Size Small Pack Rockwell Hardness B80 to C32 System of Measurement Inch Thread Direction Right Hand Thread Size 5/16 In.-18 Package Quantity 50