Is that steel or aluminum/aluminum alloy? The color and way it's pitted look more like aluminum to me. If it is, that might help narrow down the location.
This is also a pretty unique nut design. I can't find the exact thing anywhere online.
The basic arrangement is called a free spinning washer nut, but that does not account for the three internal slits. I think they may be a self-locking mechanism, but I am not sure.
Last edited by ctrlz; 02-15-2018 at 05:41 PM.
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