Coil springs made to order are also known as custom springs or specialty springs. Acxess spring manufactures many types of coil springs made to order. The most basic coil springs are compression springs, extension springs, torsional springs, and conical springs This is why we have stock items of this kind. There are more complex coil spring types that will definitely need to be made to order. These custom springs include barrel springs, garter springs, magazine springs, non-linear dual pitch springs, and wire rings. Some of these are shown in the images to the right.
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We meet the needs of multiple industries by working with a wide range of both material types and wire diameter sizes; which are the what defines a spring company’s manufacturing capabilities. Not only are we able to manufacture springs for the medical or construction industries but we’re also able to help you design them based on the device’s requirements. For example, if you need a heavy duty spring with a three eighths wire that’ll be placed into a corrosive environment, we can definitely use 0.375” Stainless Steel 302 and begin your design from there. The same goes if you need a medical spring made to order with 0.007” wire and Stainless Steel 316 (which is a much cleaner material type).
Other spring devices may require custom alterations like bends or legs which aren’t “included” in the “normal/usual” manufacturing of these springs. In the case of a compression spring, you may request that it has dual pitch, different diameters, or a certain bend on the ends for installation. These are custom compression springs which you will not be able to find in stock ANYWHERE. In this case you may us a specific drawing showing all of these requirements with precise measurements or mail us a sample so that we may do an exact replica. Remember, we will make the springs to order so if your measurements aren’t accurate on the drawing, they might also not be accurate once they come off the machine.
Material selection is arguably one of the most critical choices when designing a custom spring. Different metals and alloys have distinct mechanical properties, including tensile strength, modulus of rigidity, fatigue resistance, and corrosion resistance. Stainless Steel 302 (ASTM A313) is a go-to material for general-purpose springs, offering a good balance of elasticity, corrosion resistance, and cost-effectiveness. Stainless Steel 316 (ASTM A316), on the other hand, excels in environments where rust or chemical exposure is a higher risk, making it particularly suitable for medical or marine applications. Music wire (ASTM A228) is known for its high tensile strength and is commonly used in tightly wound springs that need to withstand numerous compression-extension cycles without deforming. Phosphor bronze (ASTM B159) is chosen when electrical conductivity or non-magnetic properties are required. By collaborating closely with your spring manufacturer and using reliable material data tables, you can pinpoint which alloy best matches your performance requirements, environmental conditions, and budget constraints.
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Dimensions form the backbone of any spring design. The Wire Diameter (d) directly impacts the spring’s load-carrying capacity and stiffness; thicker wires generally support heavier loads but require more force to compress or extend. Determining the coil diameter can involve deciding between specifying the Outer Diameter (OD) or the Inner Diameter (ID), both of which can affect the fit in your assembly. The Free Length (FL) of the spring is its length without any load and is critical for ensuring the spring can accommodate the desired travel distance in your device. The Number of Coils (N)—both active and total—determines how much the spring can deflect before bottoming out (in the case of compression springs) or how much torque it can provide (in torsion springs). The spring index (C), calculated as the ratio between the mean coil diameter (D) and the wire diameter (d), influences manufacturing feasibility and stress distribution. A spring index that’s too low or too high can make the spring difficult to produce reliably or prone to defects. All these dimensional factors interconnect, so modifying one parameter may require readjusting the others to maintain the spring’s performance targets.
MW manufactures custom coil springs to your specifications. We work with all conventional spring materials as well as specialty materials, high-temperature, and titanium alloys, with wire size capabilities from from 0.004″ to 3.00″. Our multi-slide forming equipment can also produce complex hook and leg geometries for extension and torsion springs complete off the machine.
But our expertise is not limited solely to manufacturing; we also offer design and prototyping assistance and a variety of quality control and performance testing options. Our experts will gladly work with your teams to create a suitable component for your application that meets or exceeds your expectations for cycle life, hardness, resistance to environmental factors, and more.
Learn more about our custom spring services here or request a quote to get started.