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 5935-01-143-5338
NSN 5895-01-529-6710
NSN 5855-01-064-8961
NSN 6110-00-058-2792
NSN 5835-00-092-1136
NSN 5935-00-263-2424
NSN 6150-01-112-9371
NSN 5975-01-442-6818
NSN 6220-00-104-2656
NSN 5930-00-814-0009
NSN 5935-00-452-6334
NSN 6650-00-061-2232