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I've found a shaft coupler that has a steel plate in between, but it's not clear what its function is:

enter image description here enter image description here

If it is to add strength to the coupler, isn't the coupler as strong as the weakest link, i.e. the aluminium ends? Does anyone know what the purpose of the steel plate is?

EDIT: Here's another similar design:

enter image description here

John M.
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1 Answers1

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The plate allows for small amounts of angular misalignment between the input and output shafts.

Eric S
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