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 5999-01-195-8648
NSN 2925-01-136-2551
NSN 6685-01-482-6036
NSN 5975-00-427-1063
NSN 6130-01-544-6042
NSN 6240-00-464-1874
NSN 5930-01-432-6618
NSN 6145-01-482-3638
NSN 5905-01-221-0651
NSN 5945-00-999-9519
NSN 2925-00-486-8640
NSN 6130-01-364-8830