Wall-penetrating screws, also known as tie rods, are core fastening components for wall formwork. Used together with mountain-shaped clamps and mountain-shaped nuts, they pass through formwork on both sides to tighten and secure the formwork, withstand the lateral pressure generated by concrete pouring, control wall thickness, and prevent formwork bulging and deformation. They are divided into ordinary full-thread rods, water-stop rods, and three-section cone rods; ordinary rods can be pulled out and recovered for repeated turnover after formwork removal, while water-stop rods come with a water-stop plate and are used for waterproof walls such as basements and water tanks to prevent seepage. The material is mostly Q235 round steel processed by thread rolling, with regular threads and high tensile strength, and a complete range of specifications. They are widely used in concrete formwork projects such as building construction, basements, culverts, and water storage tanks.