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 6105-00-460-0335
NSN 6610-01-245-8015
NSN 5985-01-649-6279
NSN 5905-00-889-5621
NSN 6645-01-315-2010
NSN 6610-01-442-3509
NSN 5855-01-459-7508
NSN 5855-01-526-0131
NSN 5895-01-355-7442
NSN 6610-01-545-0766
NSN 6320-01-378-6191
NSN 5855-01-035-2866