5/16"-18 Grade 2 Zinc Finish NTE Steel Jam Nylon Insert Lock Nut / THREAD DIRECTION: RIGHT-HAND NUT STYLE: A8 SINGLE BALL SEAT, HEXAGON NUT HEIGHT: 0.235 INCHES MINIMUM AND 0.265 INCHES MAXIMUM END ITEM IDENTIFICATION: 7010-01-643-9876 INSTALLATION AND EQUIPMENT KIT, DATA PROCESSING WIDTH ACROSS FLATS: 0.492 INCHES MINIMUM AND 0.502 INCHES MAXIMUM THREAD SERIES: UNC THREAD QUANTITY PER INCH: 18 NOMINAL THREAD SIZE: 0.313 INCHES PART NAME ASSIGNED BY CONTROLLING AGENCY: JAM NYLON INSERT LOCK NUT SPECIAL FEATURES: CAGE 0Y3H3 IS THE OEM MATERIAL: PLASTIC NYLON LOCKING INSERT MATERIAL: STEEL NUT SURFACE TREATMENT: ZINC NUT SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: ASTM F1941 FE/ZN 3AT ASSN STD SINGLE TREATMENT RESPONSE NUT