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 6130-01-459-2734
NSN 5990-01-432-4984
NSN 4140-00-563-7648
NSN 6320-00-164-4087
NSN 5945-01-547-9657
NSN 5920-01-184-3195
NSN 6240-00-059-7099
NSN 6620-01-442-8444
NSN 6620-01-266-5545
NSN 5945-01-360-3099
NSN 5895-01-512-5024
NSN 5996-01-655-1227