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 2925-00-238-1668
NSN 6110-00-583-0463
NSN 5996-01-537-2457
NSN 5895-00-244-1838
NSN 5925-01-167-8144
NSN 5835-01-116-2369
NSN 6240-01-166-1807
NSN 6105-00-828-9230
NSN 6650-00-012-2430
NSN 5999-00-858-0741
NSN 5910-00-976-0040
NSN 5990-01-554-4128