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 5999-00-467-6714
NSN 6130-01-300-6156
NSN 5895-01-180-9651
NSN 5960-01-089-8155
NSN 6620-01-068-4498
NSN 6320-01-449-1014
NSN 5975-01-575-3111
NSN 5920-01-487-5516
NSN 5835-01-515-6537
NSN 6685-00-381-8551
NSN 7035-01-350-4247
NSN 6220-01-161-5016