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 5945-01-517-9192
NSN 5985-01-384-6656
NSN 5950-01-446-6903
NSN 5895-01-259-5266
NSN 5965-01-444-1322
NSN 5945-00-162-4975
NSN 5950-01-346-4618
NSN 5960-01-429-5897
NSN 4140-01-210-8049
NSN 6220-01-140-1694
NSN 5920-01-455-6259
NSN 5965-00-092-8841