Torsion springs are found in many types of everyday items like retractable pens and notebooks and also play a key role in engineering designs. This article aims to simplify the various aspects of torsion springs for easier understanding. We are going to discuss their features, uses, and how to choose the appropriate torsion spring for different needs or projects.

Definition of a Torsion Spring

A torsion spring is an object that stores mechanical energy upon receiving a twisting force. This mechanical energy is then released once the force is no longer applied. This is observable in the operation of garage door mechanisms. As the door closes, the torsion springs coil and store energy. Then, upon opening the door, the springs unwind and release the stored energy, contributing to the door's lift.

The operational behavior of a torsion spring is influenced by its design and specific application. Its function may involve assisting or resisting rotational motion. Most torsion springs have straight legs attached to components that rotate around the spring's center. The application of torque causes the springs to attempt a return to their original state, influencing the movement of the attached components. The legs' design isn't uniform but adapts to the specifications of the spring's intended use.

The material, diameter, coil count, and leg design of a torsion spring impact its performance. For example, garage doors typically utilize steel springs because of their durability. Alternatively, in electrical switches, phosphor-bronze springs might be used due to their electrical conductivity.

Torsion Spring Applications

Torsion springs are found in many devices and tools, including door hinges, clothespins, and clipboards, providing and maintaining tension. One common application is a mousetrap, where the tension from a torsion spring powers the snapping mechanism.

In industrial applications, torsion springs are integrated into a range of products, from small devices such as watches to larger agricultural equipment. Within a watch, for instance, the torsion spring, or hairspring, forms an essential part of the mechanism that regulates time. In the absence of this spring, watches wouldn't keep time correctly.

Vehicle design often incorporates torsion springs, specifically in their torsion bar suspension systems. In such systems, one end of a torsion spring connects to the vehicle's chassis, and the other attaches to the wheel assembly. Upon impact with a bump, the spring undergoes a twist. This twist produces resistance and absorbs shock, leading to improved ride comfort.

Torsion springs are necessary for counterbalance mechanisms, as seen in garage door systems. In standard single-piece garage door systems, a torsion spring aids in lifting the door. As the door is lowered, the spring unwinds, releasing its stored energy. Inadequate spring selection for the door's weight might lead to damage to the door's opener from excess strain.

Within computer hinges, torsion springs are employed. The suitable force in the spring enables easy and firm screen positioning, pointing to the necessity of selecting a spring with appropriate strength and responsiveness for this use.

Torsion Spring Selection Tips


This guide to torsion springs offers fundamental knowledge necessary for their design and selection. With a clear comprehension of torsion springs, you can create improved solutions for your machines and products, thereby extending their operational duration. However, remember that different projects have different needs, and there's no single torsion spring appropriate for all. There's always a variety of options available to meet your project-specific needs. Handling and applying torsion springs require attention to detail but this level of precision results in better performance of the machines you design and manage.