Spiral torsion springs are used in various objects like clocks and car suspensions. Key factors when designing these springs include the spring's force, its composition materials, and the setting it will be used in. For instance, car suspension springs need a specific mix of rigidity and bendability - they must support the car's weight and endure road disturbances. Selecting material isn't unguided; the spring should resist constant use and harsh weather conditions. This article lists diverse applications of spiral torsion springs, their potential benefits and downsides, options for modification, and lifespan, to assist you in your design and selection strategy.

Understanding Spiral Torsion Springs

Spiral torsion springs, also known as clock springs, are made from flat metal strips coiled into a spiral shape. These springs exert a rotational force or torque when twisted around their center. The force exerted by the spring equates to the degree of the twist. This characteristic makes it applicable in various operations.

Several industries use spiral torsion springs. The automobile industry is one such example where these springs are an integral part of safety belt retraction mechanisms. The force exerted by the spring is regulated according to the average human body weight - the belt will lock immediately during abrupt movements. Changing the dimensions and material of the spring allows this force relationship to be fine-tuned, making these springs a practical component in numerous types of equipment.

The design and selection of spiral torsion springs require balance of specific parameters. If one seeks a greater angular deflection, it may result in a lesser torque, and a greater torque could lead to lesser deflection. Understanding these factors is necessary to choose the appropriate spring for a specific application.

Specific Industries and Use Cases

Advantages, Disadvantages and Customization Options

Spiral torsion springs are used for enabling angular movements in industrial applications, with wristwatches serving as a typical example. In wristwatches, these springs provide movement in the dials due to their strong construction. Their performance and suitability, though, is reliant on the specific requirements of their intended use.

It is important to note that these springs have a limit to the maximum torque they can handle. If the torque applied surpasses the spring's design limit, failure occurs. This highlights the necessity of accounting for the spring's capacity during the design stage of an application. For instance, in high-force applications, spiral torsion springs might not be the optimal choice due to limitations set by their operating mechanism and physical size.

Customizing these springs to meet the needs of an application is feasible. The choice of material influences the spring's performance. Brass and stainless steel are frequently used materials. Nonetheless, specific requests might warrant the selection of other materials. Modifications in thickness and size also play a role in the spring's function. For example, a decrease in thickness could be applied for a sensitive trigger mechanism. On the other hand, a system that needs to add resistance to rotational movement may necessitate an increase in thickness. Such configurational flexibility enables spiral torsion springs to meet the requirements of various applications.

Maintenance, Longevity and Case Studies

The functional lifespan of spiral torsion springs varies based on environmental conditions and frequency of use. Routine inspections and proper upkeep, such as application of lubricant and replacement of expired springs, can increase their usable life. The long-lasting nature of these springs is often related to quality assurance during the design and production stages.

Spiral torsion springs are applied in numerous fields, such as the automotive industry. A common use of spiral torsion springs is in seat belt systems. The spring provides the retraction force needed to pull the seat belt back into its housing after release. Appropriate selection and manufacture of these springs are necessary for the proper functioning of such mechanisms.


Spiral torsion springs find wide use across various industries including automotive and medical due to their unique properties and adaptability. They can be modified in terms of materials and dimensions based on the specific needs, resulting in precise use across diverse applications. For instance, in the automotive sector, these springs are designed to endure high temperatures and rigorous usage, promoting consistent performance. Recognizing the numerous applications of these springs and understanding their possible benefits and limitations can provide engineers with critical information necessary for design and upkeep. Notably, spiral torsion springs are a common component in numerous devices and machinery, attesting to their broad-ranging use and function.