5/16"-18 Grade 18-8 Stainless Steel Serrated Flange Nut / THREAD CLASS: 2B THREAD DIRECTION: RIGHT-HAND WASHER OUTSIDE DIAMETER: 0.660 INCHES MINIMUM AND 0.680 INCHES MAXIMUM OVERALL HEIGHT: 0.268 INCHES MINIMUM AND 0.283 INCHES MAXIMUM NUT STYLE: A294 HEXAGON WASHER THICKNESS: 0.040 INCHES NOMINAL END ITEM IDENTIFICATION: 2355-01-567-4930 WIDTH ACROSS FLATS: 0.489 INCHES MINIMUM AND 0.500 INCHES MAXIMUM THREAD SERIES: UNC THREAD QUANTITY PER INCH: 18 NOMINAL THREAD SIZE: 0.313 INCHES PART NAME ASSIGNED BY CONTROLLING AGENCY: NUT,FLANGE MATERIAL: STEEL OVERALL