1/4"-20 Zinc Finish Case Hardened Serrated Flange Nut / THREAD CLASS: 2B THREAD DIRECTION: RIGHT-HAND WASHER OUTSIDE DIAMETER: 0.574 INCHES MINIMUM AND 0.594 INCHES MAXIMUM OVERALL HEIGHT: 0.222 INCHES MINIMUM AND 0.236 INCHES MAXIMUM NUT STYLE: A294 HEXAGON WASHER THICKNESS: 0.040 INCHES MINIMUM END ITEM IDENTIFICATION: 4320-01-617-7587 WIDTH ACROSS FLATS: 0.428 INCHES MINIMUM AND 0.438 INCHES MAXIMUM THREAD SERIES: UNC THREAD QUANTITY PER INCH: 20 NOMINAL THREAD SIZE: 0.250 INCHES PART NAME ASSIGNED BY CONTROLLING AGENCY: SERRATED HEX FLANGE NUT MATERIAL: STEEL OVERALL SURFACE TREATMENT: ZINC OVERALL