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 6240-00-846-9815
NSN 4140-01-154-7033
NSN 7035-00-929-0363
NSN 6240-00-615-8978
NSN 5895-00-410-9930
NSN 5895-00-276-7916
NSN 6650-00-213-7065
NSN 6685-00-214-3722
NSN 6610-00-442-1537
NSN 5835-01-302-6844
NSN 6240-00-523-9861
NSN 5945-00-985-4440