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 6150-01-139-6759
NSN 6610-00-371-5953
NSN 5910-01-181-5677
NSN 7035-01-476-7316
NSN 6105-01-424-4902
NSN 6320-01-585-8468
NSN 7035-01-287-9817
NSN 5905-00-665-5681
NSN 5998-01-113-3378
NSN 5998-00-914-2368
NSN 5985-00-838-3851
NSN 6650-01-193-5911