I think this one is beyond Harbor Freight. This is a _highly_ unusual
fastener.
If you can't find the proper socket, you may have to resort to
fabricating one, perhaps by milling or grinding five grooves to engage
the five nubs on the fasteners, inside a thick-walled socket of the
appropriate size. (An excellent place to buy such a "donor" socket would
indeed be Harbor Freight.)
Alternatively, you can make careful measurements, CAD up a mating tool,
3D print it in plastic to check the fit and to make refinements in the
CAD model, and then have it 3D printed in metal. There are tons of fast
turn-around 3D printing houses on-line. Www.ShapeWays.com for example.
I have no clue as to why this high-security nut was selected. The design
seems somewhat amateurish in that the interconnects are so massive.
Typically, in OEM battery packs, the interconnects are shaped to bend or
flex somewhat so that cell expansion, vibration, or slight movement
won't cause damage to the seals on the cell terminals. Corrosion is
quite evident, so electrolyte has likely leaked by the damaged seals. :-(
Bill D.
On 11/17/2021 10:59 AM, Lawrence Rhodes via EV wrote:
I bet Harbor Freight will have it. If you can't take a sample take a couple of
photos at different angles. Lawrence Rhodes
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