Power fittings are iron or aluminum metal accessories used for transmission lines, collectively known as fittings. They can be classified into categories such as suspension clamp, tension clamp, U-type clamp, connecting fitting, joint fitting, protective fitting, equipment clamp, T-type clamp, busbar fitting, and wire tension fitting, based on their function and structure; they can be used as line fittings or substation fittings based on their application.