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 5950-00-683-4429
NSN 5965-01-597-8749
NSN 6220-01-502-5329
NSN 5920-01-104-4332
NSN 5960-00-199-6034
NSN 5998-00-541-8792
NSN 6220-00-489-1440
NSN 5999-00-622-9310
NSN 6110-01-295-2164
NSN 5910-01-067-8038
NSN 5990-01-101-7602
NSN 5905-01-623-7010