1-1/8"-8 A-563 Grade C Plain Finish Heavy Hex Nut / THREAD DIRECTION: RIGHT-HAND NUT STYLE: A12 HEXAGON END ITEM IDENTIFICATION: NSN 2355-01-567-4930 TRUCK,BOMB SERVICE NOMINAL THREAD SIZE: 18.0 MILLIMETERS SPECIAL FEATURES: GRADE C, WRENCH SIZE .500 IN, 0.336 IN THICKNESS, THREAD SIZE 18 MATERIAL: STEEL NUT SURFACE TREATMENT: ZINC NUT