5/16"-18 18-8 Stainless Steel Finished Hex Nut / THREAD CLASS: 2B THREAD DIRECTION: RIGHT-HAND NUT STYLE: A12 HEXAGON NUT HEIGHT: 0.266 INCHES NOMINAL END ITEM IDENTIFICATION: 2320014652174 WIDTH ACROSS FLATS: 0.489 INCHES MINIMUM AND 0.500 INCHES MAXIMUM THREAD SERIES: UNC THREAD QUANTITY PER INCH: 18 NOMINAL THREAD SIZE: 0.3125 INCHES BEARING SURFACE TYPE: CHAMFERED MATERIAL: STEEL CORROSION RESISTING OVERALL