What Are Specialty Springs?
There are many factors to be taken into mind when designing your specialty spring. There is wire diameter, outer and inner diameter, number of coils, length, etc. These spring dimensions are critical when it comes to getting the right amount of load and travel that your device requires. Even regular compression, extension, and torsion springs can be specialty springs because not every stock spring company will have the spring with the force and maximum safe travel you require. This is because there really is an infinite amount of spring design and dimensions you can have on your spring. You must also focus on your specialty spring's physical features, though.
Your spring's physical specifications are very important due to the fact that they have to fit in your mechanism. Take magazine springs for example. A magazine spring is basically an oval shaped compression spring. These specialty springs must have this shape in order to fit into a firearms's magazine clip.