The characteristics of the extension spring: Many different terminal devices or "hooks" are used to ensure the source of the extension spring's tension. The extension spring acts in the opposite direction when it is stretched or pulled apart. When the ends of the tension spring are pulled apart, the spring will try to pull them back together. Extension springs absorb and store energy. Most extension springs are usually under a certain degree of tension, even when there is no load. This initial tension determines how tightly the tension spring is coiled without any load.

Applications of extension springs: medical breathing equipment, medical mobile equipment, manual computing, home care equipment, shock absorption, pump springs, mechanical and electronic protective hardware, mechanical and aerospace components, actuators, switch equipment. It can be used in many occasions, such as production assembly, experiment, research and development, maintenance, etc. Tension springs occupy an important position in the market and are widely used in fields such as national defense, marine, computer, electronics, automobiles, molds, medicine, biochemistry, aerospace, railways, construction machinery, mining machinery, construction machinery, elevators, etc.