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 5965-01-083-7000
NSN 6110-01-074-5677
NSN 5960-01-516-7264
NSN 4140-01-157-5852
NSN 5975-01-123-9111
NSN 5998-01-507-1228
NSN 5905-01-248-3200
NSN 6645-01-067-4393
NSN 6650-01-003-4144
NSN 6145-01-269-2094
NSN 5975-01-355-7891
NSN 6150-01-034-1622