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 5996-01-471-3447
NSN 6240-01-633-9357
NSN 6135-01-519-7879
NSN 5950-01-505-2531
NSN 5935-01-049-9221
NSN 5895-01-448-8600
NSN 6105-00-556-6333
NSN 6145-00-019-0047
NSN 5855-01-236-4497
NSN 5925-01-073-4616
NSN 6240-01-073-4732
NSN 5905-01-539-3279