Wall-penetrating screws, also known as tie rods, are core fastening components for wall formwork. Used together with wing nuts and wing clamps, 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 from bulging or deforming. They are divided into standard full-thread rods, water-stop rods, and three-piece cone rods; standard rods can be pulled out and reused repeatedly 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. Made mostly of Q235 round steel with rolled threads, they feature regular threads, high tensile strength, and a complete range of specifications, and are widely used in concrete formwork projects for buildings, basements, culverts, water reservoirs, and more.