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In building construction, the formwork support system is a key element in ensuring concrete forming quality and on-site construction safety. As core small components of the system, formwork fasteners such as through-wall tie rods, wing nuts, wing clips, and stamped fasteners are small in individual size but directly determine whether the entire formwork system can stably withstand the lateral pressure generated during concrete pouring. Once the quality of accessories fails to meet standards, bulging, formwork displacement, and thread stripping are highly likely to occur, and in severe cases, formwork collapse safety accidents may be triggered, causing huge losses to the lives and safety of construction personnel, project schedules, and engineering costs. To continuously consolidate product quality and provide construction units with stable and reliable formwork support solutions, our company has recently comprehensively upgraded the full-process quality control system for formwork fasteners, establishing a closed-loop quality inspection process from front-end raw material warehousing, production and processing, finished product pressure testing, to outbound sampling inspection, and implementing quality control in every process.
Raw materials are the foundation of product quality, and this control upgrade first strengthens the incoming material inspection process. All Q235 raw materials used for producing through-wall tie rods, wing clips, and wing nuts must be verified against material certificates upon arrival. Quality inspectors conduct random sampling and send samples for testing to check indicators such as tensile strength, elongation, and hardness of the steel, preventing defective steel with excessive impurities or insufficient thickness from entering the production line. For through-wall tie rods, the straightness of round steel raw materials is a key control point; raw materials that are bent or fail to meet material standards are directly returned to suppliers. The steel plates used for wing clips strictly follow thickness standards, eliminating the use of thin materials in place of thick ones. Wing nut blanks are also screened to ensure there are no defects such as pores or sand holes inside the castings, avoiding inherent quality hazards from the source.
In the production and processing stage, the workshop has simultaneously optimized process standards. Through-wall tie rods use thread rolling rather than simple thread cutting. After thread rolling, the metal fibers of the thread are continuous, the thread root strength is higher, and thread stripping or tooth breakage is less likely to occur. Thread pitch and thread height are uniform, ensuring smooth engagement with wing nuts. Wing clips are formed by one-piece stamping from thickened steel plates, and stamping dies are calibrated regularly to ensure standard forming curvature and resistance to bending deformation under load. The trapezoidal thread of wing nuts is a key control item. The trapezoidal thread has a larger contact surface and stronger load-bearing capacity. Thread tolerances are strictly controlled during production to ensure precise matching with through-wall tie rods of corresponding specifications, avoiding problems such as inability to tighten or false engagement. During the production of stamped fasteners,重点检查冲压成型后的开裂、变形情况，配套 T 型螺栓统一选用高强度材质，螺栓韧性、扭矩达到行业标准。
In the finished product stage, the quality inspection department has added load pressure testing sampling items instead of only performing appearance checks. Samples are randomly selected from each batch of products for mechanical load testing to simulate the stress state during concrete pouring and inspect the tensile performance of through-wall tie rods, the bending resistance of wing clips, and the locking and anti-slip performance of wing nuts. Appearance inspections also check the anti-rust treatment effect. For painted and electro-galvanized products, the surface coating is uniform, with no missed plating, peeling, or sagging. All sampling data are registered and archived, and nonconforming batches are isolated and reworked as a whole, strictly prohibited from flowing into the market.
In addition to upgrading product quality inspection, our technical team has also compiled supporting usage guidelines to educate construction customers on accessory matching standards. Many formwork bulging problems on construction sites are not entirely due to product quality issues; there are also non-standard construction practices such as incorrect accessory matching, excessive spacing, and insufficient tightening force. We provide customers with reference solutions for tie rod layout based on different working conditions such as housing construction, basements, water tanks, and culverts, distinguish tie rod selection for ordinary walls and waterproof walls, and guide construction personnel to correctly match through-wall tie rods, wing clips, and wing nuts and standardize locking operations.
The safety bottom line of the construction industry must not be relaxed. Although formwork fasteners are auxiliary building materials, they affect the entire system. Going forward, our company will continue to maintain high-standard quality inspection, regularly review quality data, iterate processing techniques, and continuously and stably deliver high-quality formwork fastening accessories, helping construction units avoid safety risks in formwork systems, ensuring smooth and accurate concrete wall forming and dimensions, and safeguarding various civil engineering projects.
