I have a situation where I have vertical movements coupled with lateral and axial movements. I am wondering what the threshold of angular movement of the hanger rod relative to the spring can is before I create hinges with weldless eye nuts on both ends of the hanger rod.

Normally the allowable rotation is 5 degrees in all directions. By consideration of lateral movements with regard to the orientation of the various components it is normally possible to maximize the distance between pivot points to suit the direction of maximum displacement. For example, if connecting to a lug plate via a pin, the rotation of the pin should coincide with the direction of largest lateral movement.