Putting together a project, I've found this clutch but I've never seen this type before. It has a sort of flexible plate connecting the two parts, attached to both in two places corresponding to where the four teeth are. It seems to be working but I have no idea what torque it's ok for and how much I should compress it, if at all. Sorry for the shitty photo quality.
It could either be an oldham coupling. The photo's a bit blurry. Here's a web page on oldham couplings. https://www.huco.com/products/couplings/oldham-couplings
or it could be a Flexible flange coupling
These drive clutches can be used to absorb drive train shocks and/or slight mis-alignments of the two shafts.
These are available in several sizes and capacities.
Flexible coupling or flexible drive coupling or flexible shaft couplings, see: