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 5930-00-448-4604
NSN 7035-00-541-8516
NSN 5999-01-307-5715
NSN 5835-00-816-0394
NSN 5996-01-482-7596
NSN 6110-01-394-4163
NSN 5975-01-146-4796
NSN 6650-00-236-0724
NSN 5855-01-262-1766
NSN 5965-00-705-1690
NSN 5999-01-428-2720
NSN 5950-01-211-6358