1/2"-13 Plain Finish Grade 8 Finished Hex Nut / THREAD CLASS: 2B THREAD DIRECTION: RIGHT-HAND NUT STYLE: A12 HEXAGON NUT HEIGHT: 0.427 INCHES MINIMUM AND 0.448 INCHES MAXIMUM END ITEM IDENTIFICATION: MRAP - UNIQUE NSN - USED ON 5 MRAP VARIANTS; MRAP - COUGAR; MRAP - COUGAR ISS WIDTH ACROSS FLATS: 0.736 INCHES MINIMUM AND 0.750 INCHES MAXIMUM THREAD SERIES: M NOMINAL THREAD SIZE: 13.0 MILLIMETERS THREAD PITCH IN MILLIMETERS: 13.0 BEARING SURFACE TYPE: CHAMFERED MATERIAL: STEEL OVERALL PROPRIETARY CHARACTERISTICS: NPAC