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 6645-01-483-1518
NSN 5930-00-223-9365
NSN 6145-01-467-4129
NSN 5996-00-156-5967
NSN 6145-00-957-5575
NSN 6685-01-032-8532
NSN 2925-01-588-3507
NSN 5960-01-614-8005
NSN 5996-01-407-1286
NSN 5895-01-535-7300
NSN 5915-01-572-8852
NSN 6220-01-358-9975