The item is a flight safety critical aircraft part (fscap)
A nut having 6 flat sides and an integral washer which extends beyond the flats or periphery. An integral feature is incorporated for locking on the threads of a mating member.
Classification: Nuts of iron or steel
NSN 6240-01-446-6315
NSN 4140-01-356-5614
NSN 5835-00-880-6477
NSN 5960-01-364-1318
NSN 5965-01-121-2511
NSN 5905-01-171-1813
NSN 6220-01-222-0724
NSN 6135-01-317-6021
NSN 5925-00-386-8532
NSN 5920-01-068-0178
NSN 5895-01-119-9627
NSN 2925-01-068-3844