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 5990-01-024-9659
NSN 5905-00-337-7125
NSN 5925-01-438-3717
NSN 5965-00-081-9412
NSN 5925-00-450-9663
NSN 6620-01-037-9601
NSN 6610-00-630-4563
NSN 5905-00-090-2439
NSN 6645-01-298-8837
NSN 6650-01-308-4563
NSN 6135-00-221-4720
NSN 6620-00-992-5876