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 5975-00-232-4132
NSN 7035-01-364-0286
NSN 5996-00-772-9389
NSN 6110-01-272-1688
NSN 5920-00-793-4393
NSN 5910-01-235-1721
NSN 5905-00-186-9044
NSN 6135-01-260-7180
NSN 6135-01-294-2131
NSN 6645-00-315-9254
NSN 6105-00-024-1076
NSN 5895-01-525-4342