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 5920-01-384-3387
NSN 5950-00-118-2666
NSN 5960-01-261-6753
NSN 5996-01-078-9803
NSN 5945-01-013-2794
NSN 5835-01-276-2808
NSN 6150-01-370-2513
NSN 6610-01-095-1459
NSN 5996-00-356-0680
NSN 6610-01-273-9317
NSN 5999-00-436-2749
NSN 5915-00-740-4336