A nut having an externally splined sleeve which holds it in position when forced into a hole of slightly smaller diameter.
NSN 6110-01-437-8559
NSN 6105-01-449-2375
NSN 6145-01-343-9854
NSN 5930-00-177-7381
NSN 5950-01-444-1789
NSN 5910-00-010-9853
NSN 5999-00-302-1741
NSN 5835-01-316-3255
NSN 5950-01-062-6097
NSN 5999-00-409-2663
NSN 5998-01-459-8710
NSN 5990-01-317-4427