A nut having 6 flat sides and an integral washer which extends beyond the flats or periphery.
NSN 6105-01-323-4695
NSN 5910-00-589-5193
NSN 5915-01-069-9227
NSN 5990-00-557-8726
NSN 6650-00-170-5095
NSN 5965-01-023-0245
NSN 4140-01-115-5977
NSN 5835-01-303-6563
NSN 5985-01-237-7721
NSN 5855-01-040-3881
NSN 5996-01-374-8569
NSN 5935-01-271-0031