The rigging screw is a fitting for tightening or loosening cables or lines with fixed ends. NauticExpo offers a wide variety of rigging screws: forked, hydraulic, with articulated pin, etc.
Rigging screws usually are used to tension sailboat standing rigging (shrouds, stays).
The rigging screw is a metal fitting with an open or closed cylindrical body whose ends are tapped. Hooks, screw eyes or shackles are screwed into the ends. Some are hydraulic.
Choice will depend on the size and specific function of the cable or line to be tensioned. Other criteria include open or closed body and hook, eye screw or shackle ends.