1/2"-13 Grade 5 Zinc Finish NE Steel Nylon Insert Lock Nut / THREAD CLASS: 2B THREAD DIRECTION: RIGHT-HAND LOCKING FEATURE: PREVAILING TORQUE WITH NONMETALLIC INSERT NUT STYLE: A12 HEXAGON NUT HEIGHT: 0.609 INCHES NOMINAL END ITEM IDENTIFICATION: 4940-01-591-0265 WIDTH ACROSS FLATS: 0.750 INCHES NOMINAL THREAD SERIES: UNC THREAD QUANTITY PER INCH: 13 NOMINAL THREAD SIZE: 0.500 INCHES BEARING SURFACE TYPE: FLAT MATERIAL: PLASTIC NYLON LOCKING INSERT MATERIAL: STEEL OVERALL EXCEPT INSERT SURFACE TREATMENT: ZINC OVERALL EXCEPT INSERT