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 5935-01-417-5627
NSN 2925-01-361-5310
NSN 5960-00-039-8533
NSN 5990-01-057-4191
NSN 5990-01-514-8708
NSN 5960-01-187-3103
NSN 6220-00-296-4101
NSN 6145-00-726-3761
NSN 6220-01-141-6900
NSN 7035-01-068-5077
NSN 6685-01-062-8104
NSN 6650-01-503-5419