Torsion Springs

What are Torsion Springs?

They work by storing mechanical energy when the end of the coil is rotated around the spring axis, allowing the cylindrical wound torsion springs to exert a rotational force. Typically, the inside body diameter is mounted on a shaft, with some play between the inner diameter and the shaft for single torsion springs.

Torque is equal to force multiplied by leg length (MT=F x LL), and interestingly, standard torsion springs have a linear characteristic. This means that if, for example, a spring is deflected by 10°, which provides a torque of 1Nmm, 2Nmm would be exhibited at an angle of 20° spring deflection.

Best Practices When Using Torsion Springs from Metrol

We recommend that the load is applied to the torsion springs so the torque application binds the spring. This is because the spring is strongest in this direction. Additionally, fixed tension ends are always recommended, as they can minimise friction against the shaft. It is also worth bearing in mind that the closer the load is to the end of the torsion spring leg length, the less counterforce is created due to the increased momentum from the longer axis attachment point. If you use the maximum specified torque angle in your application, 10,000 load cycles are the maximum permitted. At 80% of the permitted torque angle, the lifespan increases to 200,000-400,000 load oscillations, and at 70%, the lifespan is almost infinite.

We Offer a Wide Range of Torsion Springs

Browse each category in our wire springs interface to view single- and double-ended springs. You can select your desired wire diameter, internal diameter, and leg position, where TC means 'number of sprung coils' and R means 'Spring Rate, Nmm per degree'). Our standard springs have straight ends and are manufactured from stainless steel.

As torsion spring manufacturers and international suppliers, we also offer a bespoke design service for made-to-order custom torsion springs here. Choose from a double or single coil, and let us know your required technical information;one of our friendly team members will be in touch to discuss and refine your requirements.

Torsion Spring Applications

As a torsion spring manufacturer, we have seen torsion springs find versatile applications across various industries, providing crucial functionality in a wide range of mechanical systems; here are some examples of non-standard designs and how our products are used:

• Heavy-Duty Torsion Springs: Designed to withstand substantial loads and torque, these springs are commonly employed in applications where a robust and durable solution is required, such as industrial machinery, agricultural equipment, and heavy construction equipment. 
• Large Torsion Springs: Characterised by their significant size and high torque capacity,  large torsion springs are frequently utilised in applications where a substantial amount of force needs to be stored and released, such as garage doors, loading dock ramps, and various automotive components. The design considerations for large torsion springs involve balancing the size and weight of the spring with the specific torque requirements of the application.
• Flat Torsion Springs: Also known as spiral torsion springs or clock springs, they have a unique design with a flat, spiral-shaped configuration. These springs are often used for efficient energy storage and release in applications where space constraints and a compact design are critical, like clock mechanisms or automotive steering systems.

Torsion Spring Suppliers and Manufacturers

If the torsion spring you require is in stock, you can expect next-day or Express Delivery from our international courier. As the leading torsion spring supplier in the UK, we guarantee both UK domestic shipping and international delivery options, which are available in our online store. Contact us if you have any questions about our range of stock and bespoke torsion springs options.