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