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 5835-01-039-4975
NSN 5945-01-006-3280
NSN 6145-01-353-7407
NSN 6610-01-085-6947
NSN 5930-01-549-4831
NSN 5925-01-364-0771
NSN 4140-01-461-2350
NSN 6650-01-093-1803
NSN 5950-01-303-6009
NSN 6685-01-070-3496
NSN 6145-00-264-8940
NSN 5930-01-147-9941