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 5975-01-227-0843
NSN 4140-01-634-0330
NSN 6685-00-863-1876
NSN 6105-01-302-5454
NSN 5965-01-142-1807
NSN 5985-01-348-0563
NSN 5960-01-016-3334
NSN 7035-01-605-3375
NSN 5985-01-434-9062
NSN 4140-01-131-2817
NSN 5930-00-267-5549
NSN 5960-00-924-7210