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 5945-00-647-3807
NSN 4140-00-709-0762
NSN 6130-01-249-3513
NSN 5975-01-595-2191
NSN 6220-01-032-6581
NSN 5855-01-100-3272
NSN 5835-01-303-6563
NSN 5930-01-051-2227
NSN 6105-00-089-3789
NSN 6130-00-301-1185
NSN 7035-01-226-8894
NSN 5930-00-043-1378