Extension springs, also called tensile springs, are found in many applications, such as a common household stapler, snow plows, garage doors and various types of spring tensioning devices. Extension springs come in a wide array of sizes from small medical devices to off-road machinery brake springs. Extension springs are commonly attached at both ends to other components and are used to create resistance against linear tensioning forces or pulling forces. These springs can be supplied with open hooks, closed eyes or various other forms of attachment on the ends and they can normally be made complete on a CNC spring forming machine.
In order to be a part of an assembly, extension springs require a method of attachment
1.) Threaded inserts
2.) Swivel hooks
3.) Twisted loops
4.) Double loops
5.) Machine loops
6.) Tapers