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 5920-01-386-5798
NSN 6645-01-317-6071
NSN 5945-00-170-5885
NSN 6220-00-993-7478
NSN 6685-01-395-2653
NSN 6610-00-170-6715
NSN 5945-01-272-3811
NSN 6145-01-043-3052
NSN 6240-00-509-2485
NSN 5950-01-485-2341
NSN 5999-01-606-1063
NSN 5920-00-820-4301