A nut having 6 flat sides and an integral washer which extends beyond the flats or periphery.
NSN 6320-01-643-0850
NSN 5975-01-016-9493
NSN 6240-01-371-3020
NSN 5930-01-141-6901
NSN 5925-01-156-0361
NSN 5999-00-691-0721
NSN 6620-01-436-2715
NSN 5855-01-388-4345
NSN 6650-01-148-2161
NSN 6610-00-891-6370
NSN 6110-00-411-5830
NSN 6610-01-076-4800