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Hebei Hankai hydraulic repair kit

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    Expansion springs are commonly used in applications where a controlled amount of force needs to be applied in a specific direction
    expansion
    expansion springs. For example, they are often used in hinge mechanisms to provide tension and assist in opening and closing doors or gates. They can also be found in retractable mechanisms, such as those used in automotive seat belts, where the spring helps to retract the belt smoothly and efficiently.