Tensile spring (pull spring) is subjected to axial tension of the coil spring, the tension spring is generally made of circular cross-sectional material. In the absence of load, the tension spring between the ring and the ring is generally tight and no gap. The use of tensile resilience (pull) to control the movement of parts, storage capacity, the size of the measurement force, etc., widely used in machinery, instrumentation. Its hook form has side hook pull spring, long hook pull spring, British hook pull spring, German hook pull spring, semi-circular hook pull spring, duck mouth hook pull spring and so on, its material has stainless steel, Qin steel, high carbon steel, phosphor copper, oil tempered alloy spring steel.
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