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 5935-00-243-2864
NSN 5990-00-177-2924
NSN 6145-00-145-8573
NSN 6650-00-163-9554
NSN 5960-00-401-0794
NSN 6240-01-289-2805
NSN 4140-00-490-0630
NSN 6220-00-919-8172
NSN 6105-01-628-9110
NSN 4140-01-616-0048
NSN 6240-00-228-8594
NSN 5915-00-249-8092