The item is a flight safety critical aircraft part (fscap)
A nut having 6 flat sides and an integral washer which extends beyond the flats or periphery. An integral feature is incorporated for locking on the threads of a mating member.
Classification: Nuts of iron or steel
NSN 6685-00-944-0094
NSN 6650-01-654-0512
NSN 6685-01-477-2349
NSN 6240-01-184-6831
NSN 5855-01-420-4988
NSN 5895-01-442-7274
NSN 6105-00-105-9409
NSN 4140-01-237-3390
NSN 5996-00-182-7627
NSN 6145-00-960-7318
NSN 6145-01-444-0812
NSN 5950-00-213-8687