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 7035-01-056-5350
NSN 5925-00-123-5767
NSN 6240-01-003-5797
NSN 5998-01-190-7026
NSN 5975-00-879-8756
NSN 5975-00-098-2874
NSN 5985-01-038-3617
NSN 6320-01-369-5014
NSN 6610-01-245-8015
NSN 6620-01-547-3967
NSN 6620-01-633-8443
NSN 5835-01-268-1924