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 6150-01-411-6299
NSN 6220-01-108-5105
NSN 5905-01-259-0141
NSN 5998-00-135-2486
NSN 5905-01-571-8793
NSN 6130-01-361-1285
NSN 6620-01-437-3146
NSN 6650-01-201-9989
NSN 6650-01-068-9248
NSN 6685-01-161-1446
NSN 5945-00-106-4303
NSN 6610-01-461-8180