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 5960-00-228-0064
NSN 5905-01-587-7002
NSN 6110-01-292-7823
NSN 6240-01-038-3761
NSN 5905-00-316-0546
NSN 5960-01-354-0762
NSN 5915-01-255-9661
NSN 5855-01-587-7608
NSN 6220-00-930-0781
NSN 5835-00-554-0399
NSN 5990-00-202-5127
NSN 5895-00-874-0324