7/16"-20 Grade C Zinc Finish Steel Top Lock Nut / THREAD CLASS: 2B THREAD DIRECTION: RIGHT-HAND LOCKING FEATURE: PREVAILING TORQUE ALL METAL DESIGN NUT STYLE: A7 CONE SEAT, HEXAGON NUT HEIGHT: 0.365 INCHES MINIMUM AND 0.463 INCHES MAXIMUM END ITEM IDENTIFICATION: MRAP - COMMON NSN - USED ON MAXXPRO CAT I AND 1 OTHER WEAPON SYSTEM; MRAP: MAXXPRO RECOVERY VEHICLE; MRAP MAXXPRO DASH ISS W/OGPK AND W/CROWS; MRAP - COUGAR CAT1 A1 WIDTH ACROSS FLATS: 0.675 INCHES MINIMUM AND 0.690 INCHES MAXIMUM THREAD SERIES: UNF THREAD QUANTITY PER INCH: 20 NOMINAL THREAD SIZE: 0.438 INCHES CONE SEAT ANGLE: 45.0 DEGREES NOMINAL PART NAME ASSIGNED BY CONTROLLING AGENCY: NUT, 7/16-NF PHC P/T LOCK TYPE MATERIAL: STEEL OVERALL MATERIAL DOCUMENT AND CLASSIFICATION: IFI-100/107, GRADE C ASSN STD SINGLE MATERIAL RESPONSE OVERALL PROPRIETARY CHARACTERISTICS: NPAC SURFACE TREATMENT: ZINC OVERALL SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: ASTM F1941, FE/ZN 3A ASSN STD SINGLE TREATMENT RESPONSE OVERALL