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 5930-01-295-2371
NSN 2925-01-540-7389
NSN 6135-00-062-5080
NSN 5895-01-386-3049
NSN 5935-01-537-4049
NSN 5990-01-517-7848
NSN 5895-01-082-4065
NSN 6150-01-536-3428
NSN 5998-01-232-6191
NSN 5990-00-727-0723
NSN 4140-01-542-0512
NSN 7035-01-421-4446