Join us as we explore the world of compression springs. This guide introduces you to a wide variety of these important components, from Commercial Off-The-Shelf (COTS) springs to those you can customize. Selecting the right spring involves more than just preference; it also requires understanding and considering various factors such as load-bearing capacity, material elasticity, and cost. To illustrate this, consider a stainless steel spring, known for its durability. However, it may not be the ideal choice every time due to budget constraints or if its specifications are more than your project requires. This detailed review of the compression spring market aims to increase your knowledge and guide your design choices.

COTS Spring Manufacturing Process

Commercial off-the-shelf (COTS) springs, known for their uniformity in size and material, are widely manufactured. Their manufacturing process is geared towards bulk production, resulting in a consistent supply. These springs are a fit for applications that do not necessitate custom designs.

Manufacturing of these springs begins with the selection of an appropriate wire. Decisions are based on the desired dimensions and material properties. The selected wire is then coiled around a cylindrical shape to create the spring. Subsequently, the coiled wire undergoes tempering, a heat treatment procedure, to augment the strength of the spring. A coating is applied to the spring to bolster its durability and resilience against various environmental conditions. For instance, springs utilized in marine settings, where exposure to corrosive salts is common, can benefit from this protective coating.

The generic nature of COTS springs sometimes restricts their use in specialized circumstances. Taking an aerospace context as an example, where weight and size have stringent restrictions, a designed-to-specifications spring could potentially outperform a COTS spring.

Custom Springs

Custom springs are designed to meet precise specifications not offered by COTS springs. For example, an aerospace company might require a custom spring designed to withstand the substantial forces produced during a rocket launch.

The creation of these springs necessitates a comprehension of the application's demands, which consist of load type, anticipated stress, and environmental conditions. These aspects guide the choice of material, with an emphasis on durability and load bearing capacity. Still, there could be a trade-off between material strength and cost. Inconel® and Elgiloy® provide high strength but are more expensive compared to alternatives like stainless steel or music wire.

During the spring's construction, the chosen wire is coiled, with quality inspections at each stage to ensure that the end product fulfills the requirements. The precision of the coiling process may vary based on the intricacy of the design and the properties of the chosen material. For instance, materials with a high degree of hardness could require more cautious handling during coiling to prevent wire damage. Thus, when selecting a custom spring, engineers should evaluate factors such as application requirements, material properties, and manufacturing complexities.

Spring Selection

Identifying the suitable compression spring depends on a comprehensive knowledge of the task's prerequisites. These include reviewing factors such as load bearing ability, operational condition, substance used, and distinctive spring features like the spring rate and deflection. Awareness of these parameters helps to guarantee the spring's dependability in its intended role. For instance, selecting a spring with a high spring rate for a low load demand application can increase the cost and potentially decrease the component's lifespan.

The selection method varies for each application. Certain situations might need engineers to emphasize specific features above others. High temperatures might require a substance that does not supply the ideal spring rate, requiring alterations in other parts of the spring's design. In this situation, the objective is to establish a suitable equilibrium that fulfills the overall performance and durability requirements of the application.

In the case of a corrosive environment, focus may shift to a spring material that is corrosion-resistant rather than targeting optimal load capability or spring rate. Even with the trade-off on other attributes, it enhances the spring's lifespan and performance.

Outlining project prerequisites plays a key role in the spring selection process, but the decision-making doesn't stop there. Acknowledging the impact of each element and their intersections allows engineers to enhance the performance and cost-effectiveness of their selected springs, leading to improved project results overall.


When considering compression spring sales, it's crucial to comprehend the characteristics of COTS springs compared to custom springs. This understanding can guide your spring selection to best meet your project needs. Your selection isn't just influenced by cost, it also involves considering the long-term performance of the application. COTS springs offer immediate availability and initial cost benefits, yet they may not meet some specific project demands. In such situations, custom springs, although they require a larger starting investment, provide continuous functionality and improved lifespan.

Feel free to check out the CoilsDB Spring Calculator to get a sense of what COTS springs may be available, while generating a custom spring configuration that can be used, should there be no precise COTS solution for your needs.