Manufacturer Part Number: 31281|Nut Type|Castle Lock NutMaterial|SteelThread Size (Inch)|5/16-24Thread Size (mm)|Material Grade|5Height (Decimal Inch)|Height (mm)|Height (Inch)|Width Across Flats (Decimal Inch)|Width Across Flats (Inch)|Width Across Flats (mm)|Locking Style|Flange Diameter (Decimal Inch)|Thread Direction|Right HandThread Fit Class|Standards|J995Insert Material|Fastener Standard|J995Military Specification|Does Not Meet Military SpecificationsWidth Across Points (Decimal Inch)|Width Across Points (mm)|System Of Measurement|InchFinish Coating|ZincAdditional Information|Product Service Code|UNSPSC Code|