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 6645-01-496-7144
NSN 6620-01-536-7799
NSN 5950-01-297-0767
NSN 5998-01-223-3112
NSN 5895-01-609-0841
NSN 5965-01-182-5768
NSN 5905-00-707-0795
NSN 6685-00-215-1997
NSN 6620-01-580-3413
NSN 5895-01-278-4288
NSN 6620-00-951-0153
NSN 5975-01-063-7577