A nut having a sleeve portion on its under side, which can be crimped or clinched to hold the item in place when inserted in a hole.
NSN 5945-01-540-1519
NSN 6645-01-469-9094
NSN 6135-00-451-0709
NSN 6240-00-079-0112
NSN 5835-01-235-4194
NSN 7035-00-052-2188
NSN 6105-01-455-9212
NSN 6135-00-593-6831
NSN 6150-00-115-0380
NSN 6145-01-391-4113
NSN 7035-01-534-7930
NSN 5999-01-305-5427