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 5910-00-370-2471
NSN 6620-01-230-8064
NSN 5925-00-856-4818
NSN 6240-01-201-6965
NSN 6130-01-037-5146
NSN 6145-00-999-4333
NSN 4140-01-347-7842
NSN 5895-01-570-5557
NSN 6620-01-451-3742
NSN 5985-01-430-9750
NSN 6650-00-614-1711
NSN 6240-00-364-0850