A nut having 6 flat sides and an integral washer which extends beyond the flats or periphery.
NSN 5920-00-842-4749
NSN 5990-01-649-4647
NSN 5835-01-647-6426
NSN 5920-01-350-4426
NSN 5965-01-441-6842
NSN 5998-01-263-6065
NSN 6220-01-361-9765
NSN 4140-01-091-0270
NSN 5975-00-374-5245
NSN 5960-01-322-7820
NSN 4140-01-006-0957
NSN 6645-01-651-0911