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 6320-01-089-9086
NSN 5998-01-067-7820
NSN 5930-00-989-5983
NSN 5915-01-290-4828
NSN 5950-01-323-4882
NSN 5905-00-074-3261
NSN 5998-01-258-4821
NSN 5965-01-122-5390
NSN 6150-01-239-2668
NSN 5950-00-681-2347
NSN 6650-01-455-8923
NSN 5945-01-388-2953