5/8"-11 SAE J995 Grade 5 Zinc Finish Steel Jam Nut / THREAD CLASS: 2B THREAD DIRECTION: RIGHT-HAND NUT STYLE: A12 HEXAGON NUT HEIGHT: 0.363 INCHES MINIMUM AND 0.387 INCHES MAXIMUM END ITEM IDENTIFICATION: 4940-01-591-0265; ARMORED MULTI-PURPOSE VEHICLE (AMPV) WIDTH ACROSS FLATS: 0.922 INCHES MINIMUM AND 0.938 INCHES MAXIMUM THREAD SERIES: UNC THREAD QUANTITY PER INCH: 11 NOMINAL THREAD SIZE: 0.625 INCHES BEARING SURFACE TYPE: FLAT SPECIAL FEATURES: MATERIAL IS GRADE 5 STEEL MATERIAL: STEEL OVERALL SURFACE TREATMENT: ZINC OVERALL