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 5975-00-286-8506
NSN 5960-00-690-7202
NSN 5855-01-423-0817
NSN 6105-00-838-5826
NSN 5930-01-645-8883
NSN 5895-01-633-5326
NSN 6320-00-456-2092
NSN 5930-01-020-4717
NSN 6610-00-420-6826
NSN 5915-01-590-6232
NSN 6645-01-043-5236
NSN 5975-01-165-2035