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 2925-01-016-0876
NSN 6135-00-708-0892
NSN 5960-01-539-1956
NSN 5996-01-461-3464
NSN 4140-01-125-5187
NSN 4140-00-780-3557
NSN 6150-00-079-1101
NSN 6105-01-131-9677
NSN 5975-01-603-0432
NSN 5945-01-125-5798
NSN 5905-00-666-1468
NSN 5985-01-146-5679