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 6145-01-454-7011
NSN 7035-01-474-6127
NSN 5945-01-045-0473
NSN 5920-00-345-5833
NSN 6320-01-388-9450
NSN 5985-01-399-4556
NSN 5855-00-688-9954
NSN 5915-01-030-3022
NSN 5999-00-925-2502
NSN 6240-01-025-4495
NSN 6240-00-717-0844
NSN 6105-01-466-9090