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 5930-01-504-9567
NSN 5990-00-884-1743
NSN 6135-00-951-3426
NSN 4140-01-483-8040
NSN 6320-01-216-1678
NSN 6220-00-959-1195
NSN 5945-00-296-1729
NSN 4140-01-451-8771
NSN 5960-01-370-4285
NSN 6105-01-341-4307
NSN 5998-00-231-0251
NSN 5835-01-572-9308