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 5996-00-258-4954
NSN 6685-01-118-0080
NSN 6240-01-467-9719
NSN 4140-00-376-5712
NSN 6650-01-488-6418
NSN 2925-00-149-0760
NSN 6620-01-364-0195
NSN 6240-01-306-8962
NSN 5945-01-050-8453
NSN 5998-00-518-5418
NSN 6105-00-065-3795
NSN 5996-01-363-1106