1/4"-20 Nylon Finished Hex Nut / THREAD CLASS: 2B THREAD DIRECTION: RIGHT-HAND NUT STYLE: A12 HEXAGON NUT HEIGHT: 0.235 INCHES NOMINAL END ITEM IDENTIFICATION: F-15SA WIDTH ACROSS FLATS: 0.421 INCHES NOMINAL THREAD SERIES: UNC THREAD QUANTITY PER INCH: 20 NOMINAL THREAD SIZE: 0.250 INCHES BEARING SURFACE TYPE: CHAMFERED PART NAME ASSIGNED BY CONTROLLING AGENCY: NYLON FINISHED HEX NUT MATERIAL: PLASTIC NYLON OVERALL