A sag rod, also known as a tension rod or tie rod, is a structural component used to provide support and stability to various structures, particularly in situations where there is a need to counteract the forces of gravity or tension. Sag rods are commonly used in construction, engineering, and utility applications to prevent excessive sagging, swaying, or buckling of structures under their own weight or external loads. The primary purpose of a sag rod is to maintain the integrity and stability of structures, especially in situations where traditional compression members may not be sufficient. They are used in applications where structures need additional support to resist gravitational or tensile forces.