Transmission tower lock nuts.
Hydraulic nut splitter - GIF
Hexagon nut art - GIF
Flange nuts made by three different methods - video
Autosplitter nut splitters - GIF
Nut sorting/storage in one - photo
Interesting. I had never seen these so I did some googling. These are patented as anti-theft, and are a replacement for needing to weld towers together since they can be installed using basic tools and will not loosen. I suspect that if there is a need to remove them, they have to either split the nut or cut the stud out.
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