I'd suggest creating a basic 3D model and working with that in 3D, but then again I tend to use new technology in an old-fashioned way.
Assuming your J-Hooks are bent sheet metal like they appear in the image, follow these steps:
You have a couple of options available to you. I tend to create all of my hangers as mvparts and that is certainly an option. Just add a pipe connector to where the threaded rod would normally attach. You can also create the j-hook as a structural member. You can add the 3D block to the end of a round structural member, in this case the size of the threaded portion of the hook. You can then add the structural member and the j-hook will be attached to one end of the member. This will allow you to stretch the threaded portion of the hook to any length you like.
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