An extension spring is a type of coiled spring that is designed to store and release energy by extending or elongating. It consists of a tightly wound coil made of durable and flexible material, typically steel. Extension springs are commonly used in various applications, such as garage doors, trampolines, and industrial equipment, where they provide linear force or tension. The operation of an extension spring relies on its ability to stretch when a force is applied and then return to its original shape when the force is removed. When the extension spring is stretched, it accumulates potential energy within its coils. This energy is stored, and when the force is released, the spring contracts, exerting a pulling force or tension. This tension can be utilized to counterbalance weights, provide resistance, or control the movement of a mechanism. Extension springs are designed with specific load capacities and elongation characteristics to suit their intended applications. They are engineered to withstand repeated stretching and contracting cycles without experiencing significant deformation or loss of performance. However, over time or due to excessive stress, extension springs may require repair or replacement to maintain their optimal functionality and ensure the safe operation of the associated systems.