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 5915-00-149-1458
NSN 5965-00-289-6280
NSN 5998-00-284-2017
NSN 5905-00-580-1748
NSN 5910-01-462-3748
NSN 2925-01-507-9708
NSN 5935-01-257-8266
NSN 5905-01-113-8689
NSN 5965-01-200-6613
NSN 6135-00-255-1340
NSN 6620-00-335-9462
NSN 6320-00-994-0179