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 5965-00-431-2492
NSN 5895-01-305-1328
NSN 5910-00-577-6173
NSN 7035-01-102-8111
NSN 6220-01-004-2024
NSN 5895-01-174-7384
NSN 5945-00-645-2309
NSN 6130-01-595-0810
NSN 5920-00-465-8488
NSN 5998-01-291-5022
NSN 6150-00-307-2652
NSN 5985-00-014-0350