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 6610-01-140-5921
NSN 5915-01-478-7464
NSN 6320-00-343-1798
NSN 6320-01-412-2973
NSN 6110-01-508-8011
NSN 5960-01-421-7394
NSN 6240-00-078-2360
NSN 6650-00-842-5463
NSN 5996-00-739-2315
NSN 5965-01-097-2027
NSN 7035-00-500-7839
NSN 6650-01-572-9468