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Extension springs are a type of tension spring. Helical extension springs store energy and exert a pulling force. Extension springs differ from compression springs in that they do not have a solid stop to prevent overloading.  For this reason, they are designed with lower stress levels.  Typical applications include balance scales, trampolines, garage doors, dock levelers, farm machinery and various types of spring tensioning devices.

Many designs call for including loops or hooks at each end, making it easy to use the spring to connect two parts. In order to be a part of an assembly, extension springs require a method of attachment.  Threaded inserts, swivel hooks, twisted loops, and side loops are just a few of the nearly limitless options available.  At the design stage, the length and positioning of the hooks at each end of the spring can be adjusted in order to obtain exactly the required spring load at any extended position. 


Extension Springs

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