1/2"-13 SAE J995 Grade 5 Zinc Finish Steel Slotted Hex Nut / THREAD CLASS: 2B THREAD DIRECTION: RIGHT-HAND NUT STYLE: A1 CASTELLATED, HEXAGON NUT HEIGHT: 0.427 INCHES MINIMUM AND 0.448 INCHES MAXIMUM END ITEM IDENTIFICATION: 015331853 WIDTH ACROSS FLATS: 0.736 INCHES MINIMUM AND 0.750 INCHES MAXIMUM THREAD SERIES: UNC THREAD QUANTITY PER INCH: 13 NOMINAL THREAD SIZE: 0.500 INCHES BEARING SURFACE TYPE: WASHER FACED SPECIAL FEATURES: MULTIPLE MANUFACTURERS FOR THIS ITEM MATERIAL: STEEL OVERALL