1/2"-20 Grade 2 Zinc Finish NTE Steel Jam Nylon Insert Lock Nut / THREAD CLASS: 3B THREAD DIRECTION: RIGHT-HAND LOCKING FEATURE: PREVAILING TORQUE WITH NONMETALLIC INSERT NUT STYLE: A12 HEXAGON END ITEM IDENTIFICATION: TOW TRACTOR, AIRCRAFT WIDTH ACROSS FLATS: 0.750 INCHES NOMINAL THREAD SERIES: UNF THREAD QUANTITY PER INCH: 20 NOMINAL THREAD SIZE: 0.500 INCHES BEARING SURFACE TYPE: FLAT PART NAME ASSIGNED BY CONTROLLING AGENCY: LOCK NUT, ZINC PLATED, NYLON INSERT MATERIAL: STEEL OVERALL EXCEPT INSERT SURFACE TREATMENT: ZINC OVERALL EXCEPT INSERT