A nut having 6 flat sides and an integral washer which extends beyond the flats or periphery.
NSN 6105-01-609-5870
NSN 5925-01-193-0171
NSN 5975-01-556-6189
NSN 6610-00-810-3245
NSN 5905-01-264-0605
NSN 4140-01-565-8487
NSN 5996-00-563-4251
NSN 6650-01-565-4594
NSN 5990-00-306-0222
NSN 5985-01-062-5538
NSN 5960-01-155-1962
NSN 5965-00-083-8157