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 6145-01-220-2309
NSN 5910-00-419-3680
NSN 5915-01-023-7674
NSN 6650-00-569-1762
NSN 4140-01-328-8612
NSN 6645-01-011-6459
NSN 6645-01-459-7788
NSN 6135-00-985-7887
NSN 6130-01-375-4704
NSN 5925-01-215-1386
NSN 6220-00-601-2582
NSN 5985-00-079-6401