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 5998-01-406-0301
NSN 6620-00-694-8273
NSN 6110-00-918-8768
NSN 5985-01-601-0564
NSN 5905-01-115-4001
NSN 6645-01-241-2294
NSN 6130-01-320-6922
NSN 5965-00-826-0282
NSN 6110-01-463-6986
NSN 6685-01-283-9009
NSN 5925-01-388-3325
NSN 6620-01-169-9470