1/2"-20 SAE J995 Grade 8 Yellow Zinc Finish Steel Jam Nut / THREAD CLASS: 2B THREAD DIRECTION: RIGHT-HAND NUT STYLE: A12 HEXAGON NUT HEIGHT: 0.438 INCHES NOMINAL END ITEM IDENTIFICATION: MRAP - COUGAR WIDTH ACROSS FLATS: 0.750 INCHES NOMINAL THREAD SERIES: UNF THREAD QUANTITY PER INCH: 20 NOMINAL THREAD SIZE: 0.500 INCHES BEARING SURFACE TYPE: CHAMFERED PART NAME ASSIGNED BY CONTROLLING AGENCY: 1/2 - 20 GRADE 8 YELLOW ZINC HEX JAM NUT MATERIAL: STEEL OVERALL SURFACE TREATMENT: ZINC OVERALL