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rommel fastener springs are a widely used class of mechanical components for fastening connections. They are helical springs that withstand axial compressive loads. Springs are generally classified into constant-pitch and variable-pitch types. Compression spring shapes include cylindrical, conical, convex (barrel-shaped), concave (hourglass-shaped), and a small number of non-circular forms. There is a certain gap between the coils of a compression spring; when subjected to external loads, the spring compresses and deforms, storing strain energy. Variable-pitch springs are becoming increasingly common, rather than only constant-pitch springs being used. Variable-pitch springs can perform different functions in different environments.