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 6620-01-288-2627
NSN 6145-00-003-4173
NSN 5925-01-065-6374
NSN 5975-01-163-8806
NSN 6105-00-147-2819
NSN 5999-00-189-0032
NSN 5996-01-614-9376
NSN 5950-01-415-3910
NSN 5935-00-591-2562
NSN 5950-00-888-9673
NSN 5915-01-534-7614
NSN 6145-00-213-9181