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 5950-01-364-1062
NSN 6650-01-263-5412
NSN 5915-00-269-9252
NSN 6685-01-227-6785
NSN 6320-00-456-0836
NSN 5895-01-199-2511
NSN 5996-01-028-3027
NSN 5925-00-932-0108
NSN 6130-01-225-0675
NSN 6135-01-223-3869
NSN 5915-01-633-9845
NSN 5960-00-850-9623