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 6240-01-534-4007
NSN 5945-01-196-6030
NSN 5910-00-037-7550
NSN 5935-01-362-2908
NSN 5999-01-054-2103
NSN 5950-01-131-0414
NSN 5965-01-293-5076
NSN 5975-01-134-3476
NSN 5935-01-193-5995
NSN 4140-00-064-7283
NSN 5920-01-606-8573
NSN 6130-01-610-6020