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hembeck springs are helical springs that withstand axial tensile forces. Extension springs are generally manufactured from round cross-section material. When not under load, the coils of an extension spring are usually tightly closed with no gap. Many different end fittings or "hooks" are used to ensure the source of tensile force for the extension spring. The working principle of extension springs is opposite to that of compression springs. Compression springs exert a reactive force when compressed, while extension springs exert a reactive force when extended or pulled apart. When the two ends of an extension spring are pulled apart, the spring attempts to pull them back together. Like compression springs,