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 5985-00-885-7023
NSN 4140-01-570-7703
NSN 5950-00-960-7625
NSN 6320-00-519-0770
NSN 6240-00-786-6170
NSN 5855-01-502-2789
NSN 5965-01-519-5159
NSN 5905-01-187-4384
NSN 5945-00-272-8958
NSN 5930-00-502-6769
NSN 6135-01-348-8264
NSN 7035-00-940-2486