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 6150-00-062-1147
NSN 5996-01-113-7960
NSN 6685-01-594-3024
NSN 5945-01-350-4132
NSN 6220-00-627-5860
NSN 6105-01-045-7917
NSN 6620-00-224-3479
NSN 5935-01-102-2860
NSN 5915-01-455-5752
NSN 5990-00-296-4825
NSN 6650-01-399-8552
NSN 6645-01-502-1901