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 4140-00-624-7627
NSN 5935-00-202-5808
NSN 6240-01-578-1064
NSN 5905-01-283-8842
NSN 5996-01-018-1635
NSN 6135-00-194-9354
NSN 5965-01-109-2917
NSN 6130-01-527-7841
NSN 6620-01-106-9100
NSN 5835-01-350-0566
NSN 6685-01-619-0609
NSN 6685-01-294-7505