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 5950-01-231-5860
NSN 6135-00-947-7091
NSN 5895-00-177-7924
NSN 6620-01-165-3784
NSN 5996-01-629-6223
NSN 6620-01-081-1042
NSN 6240-00-104-4662
NSN 5975-00-215-8571
NSN 2925-00-902-3881
NSN 5950-00-498-0553
NSN 5965-00-021-5620
NSN 6110-01-315-5270