I am trying to find a good coupler for a NEMA 23 stepper.
I have had bad luck with the "spiral" aluminum couplers that were shipped with the motors from automation technologies.
The motors are rated as 570 oz-in. holding power, I suspect that there are many variables the would change what the motors deliver to a coupler.
Couplers are rated in "in-lbs" I tried using one rated at 8in-lbs and it did not last very long.
I would like to use one that would stand up to a crash/stall out the stepper......
I found these two:
https://www.mcmaster.com/2764K226/
https://www.mcmaster.com/2764K318/

Rated at 18in-lbs and 44in-lbs

I would need to add a spacer in the mount to use the 44in-lbs one.

Looking for advice.