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 6105-01-108-9224
NSN 5920-01-571-8027
NSN 5998-01-184-0264
NSN 6135-01-177-3552
NSN 6130-01-469-7497
NSN 5855-01-388-2424
NSN 5985-01-025-9251
NSN 5985-01-508-7311
NSN 5835-01-238-3381
NSN 5925-01-015-7873
NSN 6645-00-472-4048
NSN 5996-01-411-6195