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 7035-01-091-7481
NSN 5915-01-397-8525
NSN 5935-01-218-4338
NSN 6610-01-457-1974
NSN 6240-01-370-0511
NSN 5925-01-647-3593
NSN 5920-01-195-7254
NSN 5965-00-150-1144
NSN 5915-01-035-8828
NSN 4140-01-272-4041
NSN 5996-01-295-1256
NSN 6645-00-246-4934