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 6610-01-467-4582
NSN 6220-01-394-5263
NSN 5835-00-707-6266
NSN 4140-01-378-6386
NSN 5920-00-518-1793
NSN 5960-00-658-7209
NSN 5925-01-415-0128
NSN 6145-01-171-8160
NSN 5855-00-951-6483
NSN 5935-00-639-1382
NSN 6645-00-416-8864
NSN 6105-00-253-5520