A nut having 6 flat sides and an integral washer which extends beyond the flats or periphery.
NSN 5985-00-518-1748
NSN 5990-01-232-2625
NSN 5930-01-196-4368
NSN 5920-00-170-4247
NSN 6620-01-544-4857
NSN 5985-00-473-2161
NSN 6685-01-453-7894
NSN 5835-01-584-3245
NSN 6320-01-176-8367
NSN 6650-01-004-1261
NSN 5990-01-357-6175
NSN 6240-01-194-2206