[electricboats] What kind of fitting is this?

Hello,

I am evaluating an EV kit and I see this shaft on a drive motor... notice the female toothed grooves in the shaft... and I've not seen this before nor can I figure out what it is called.

Does anyone know the right way to describe this kind of fitting and what the corresponding male part looks like (say, for mounting a pulley)?

Thanks,
-Ryan




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