Torsion springs, which operate in rotary or circular paths, are a good choice for spring needs in diverse areas including car suspensions and machinery susceptible to heavy vibrations. Choosing the right torsion spring with suitable torque is crucial to prevent damage to equipment and improve safety.

In this article, we detail the process of making commercial off-the-shelf (COTS) springs including the considerations involved. We also outline the procedure for designing custom springs to meet unique requirements. Furthermore, we provide insights on selecting the right spring factoring in design specifics, working conditions, materials, and load ratings. Whether the choice leans towards COTS or custom springs, this decision greatly impacts device safety, sustainability, and functionality. Let's delve into the complexities of torsion spring selection.

COTS Spring Manufacturing Process

Commercial off-the-shelf (COTS) springs undertake a routine manufacturing process comprised of several steps. The initial step is coiling, a procedure where a wire wraps around a cylinder to generate the spring form. The wire thickness and cylinder dimensions guide the mechanical characteristics of the spring, marking its possible uses.

The coiled wires then proceed to a thermal treatment procedure. This process aims to mitigate mechanical stresses developed during coiling and to enhance the spring's resistance to deformation. The specific settings for this heat treatment - temperature and duration - are largely influenced by the spring wire material. For instance, the heat treatments for steel springs differ from copper-alloy springs.

The final phase is finishing, which includes coating or plating the springs to improve their longevity and corrosion resistance. For instance, brass plating is a frequently used finish because of its decent resistance to corrosion and cost. Coatings with higher durability, like ceramic or Parylene, offer enhanced protection levels, but at an increased cost. Therefore, selecting a coating involves careful consideration of both the protection level and price - a critical factor in sales decision.

Custom Springs

Custom springs are created following specific parameters including coil direction and leg length. The selection of materials - such as stainless steel, copper, or a mix - relates directly to the design requirements.

The functionality and safety of a spring depend on its operating conditions. As such, engineers should consider the temperature and pressure conditions the spring will undergo. For example, stainless steel is a suitable choice for custom springs used in high-temperature environments due to its heat resistance.

The production process of custom springs demands precision. Specialised machinery, calibrated for exact cuts and winding techniques, is utilised. Yet the quality of a spring also relies on the skills of the engineers throughout the production phases.

Take, for instance, a torsion spring, which works based on torque. When manufacturing this type of spring, the winding direction should correspond with the force direction in its application. Any mismatch, such as a counter-clockwise winding in a clockwise application, could result in problems like rapid wear or system failure.

When working with torsion spring design, selection, and manufacturing, every choice is critical due to the spring's role in torque transmission in a variety of applications, like automobiles and spacecraft. An incorrect design could potentially impinge on its purpose and the safety of the system.

Spring Selection

The type of spring chosen influences the performance of the project or device. Evaluate elements such as the operating environment, anticipated load, necessary deflection, and usage frequency. For example, a project that involves a high-frequency operation would be best fulfilled by a robust spring capable of preserving its physical characteristics under such circumstances.

From a functional viewpoint, life expectancy of the spring, resistance to rust, and space constraints can assist in determining the most suitable spring. The significance of these factors, however, may differ. For example, the resistance of the spring to corrosion becomes less crucial in contexts that are dry and free from corrosive elements.

Engaging with torsion spring sales representatives can be beneficial. These representatives possess comprehensive knowledge and data that can aid in making a knowledgeable selection. For instance, they can provide insights into the prospective load-deflection patterns of various springs, dependent on the springs' material compositions and geometric arrangements.


In conclusion, springs are essential in a variety of applications, each with unique specifications. Off-the-Shelf (OTS) springs offer an easily accessible solution for typical needs. On the other hand, for specialized design requirements, customized springs may be the better choice. Careful spring selection can enhance the operation of your project and extend the life of your equipment. Torsion spring sales present an opportunity to find the best spring for your designs. Precision is key; avoid guesswork and aim for a logical approach in selecting and testing springs to ensure optimal performance.