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 5930-01-595-4712
NSN 7035-00-140-3070
NSN 7035-01-056-5350
NSN 5960-01-481-8051
NSN 5945-01-224-1105
NSN 6685-01-017-4488
NSN 5935-00-614-3962
NSN 6685-00-137-7707
NSN 6130-01-421-7142
NSN 6685-00-596-8765
NSN 4140-01-654-5140
NSN 6320-01-476-7702