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spax fastener springs are a type of mechanical component used for fastening connections and are extremely widely applied. They are helical springs that withstand axial pressure. Springs are generally divided into constant-pitch springs and variable-pitch springs. The shapes of compression springs include: cylindrical, conical, convex, concave, and a small number of non-circular shapes. There is a certain gap between the coils of compression springs; when subjected to external loads, the spring contracts and deforms, storing deformation energy. Variable-pitch springs are becoming increasingly common, no longer limited to just constant-pitch springs; variable-pitch springs can perform different functions in different environments. Spring