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Coil Springs & Wire forms

Torsion bar springs

Torsion bar springs are designed to deliver precise rotational torque in applications where radial space is limited, but axial space is more generous. Their compact, straight-wire construction makes them a robust alternative to a tension spring with a different force functionality.

At Lesjöfors, we manufacture high-performance torsion bars with circular cross-sections and custom end configurations to ensure efficient torque transfer. Our global production capabilities and technical expertise ensure consistent performance in even the most demanding environments.

Technical specifications

Wire diameter:

0.1 mm to 9 mm 

Coil diameter:

0.1 mm to 9 mm

Features:

Round, square, or rectangular wire profiles

Materials:

Chrome, steel, & alloys

End types:

As required

Surface treatments:

Powder coating, zinc phosphating, electroplating, or painting

A torsion bar spring, a silver metal hook with a U-shaped bend resting on a white background.
A thin, torsion bar spring with a smooth surface and a curved hook at one end, displayed on a plain white background.

Get a custom spring solution

A thin, torsion bar spring with a smooth surface and a curved hook at one end, displayed on a plain white background.

What are torsion bar springs?

Torsion bar springs are straight, cylindrical bars designed to deliver rotational force – or torque – when twisted along their axis. Made from high-strength materials with a circular cross section, they store mechanical energy as they twist and return to their original position when the torque is released.

Torsion bar spring suspension systems are widely used in automotive and industrial equipment applications for their space efficiency and durability.

 

 

Product availability

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Custom torsion bar springs

Every application is unique, which is why we design custom spring systems tailored to your exact needs. From wire diameter and length to material choice and end configurations, our engineers collaborate with you to deliver torsion bars optimized for your specific torque, space, and performance requirements.

With decades of experience and advanced manufacturing capabilities, we ensure every custom torsion bar spring meets the highest standards of durability and precision.

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Precision torsion bar spring manufacturing

Our torsion bar springs are engineered for maximum strength and reliability, built to deliver consistent torque and long service life in demanding environments. Each spring is manufactured from high-grade materials with a circular cross section, formed and machined to exacting tolerances, and we support a wide range of bar diameters and lengths. 

Surface treatments, such as powder coating, electroplating, or painting, can be applied to improve corrosion resistance or achieve specific visual finishes. Conditioning processes like heat treatment and shot peening are applied based on load and application requirements.

  • Diameters of 0.1 to 9 mm supported
  • Round, square, or rectangular wire profiles
  • Surface treatment options for durability and finish
  • Certified to ISO 9001, ISO 14001, and ISO 45001 standards
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High-performance torsion bar spring materials

Choosing the right material is essential to ensure torsion bar springs deliver consistent torque, strength, and longevity under real-world operating conditions. Key considerations include fatigue resistance, yield strength, corrosion protection, and temperature tolerance, all of which directly impact performance and service life.

Materials like chrome silicon and chrome vanadium are widely used in torsion bars because of their excellent fatigue properties and resilience under cyclic loading. Stainless steel is selected for its corrosion resistance in harsh environments, while nickel and titanium alloys are used for more specialized applications requiring high strength-to-weight ratios or extreme temperature stability.

Lesjöfors maintains one of the world’s largest inventories of spring wire, including premium-grade materials specifically suited to torsion bar applications. This extensive stock, combined with global production and logistics capabilities, ensures fast lead times and consistent quality.

Our engineers work closely with customers to specify the ideal material for each application, whether for heavy industrial machinery, automotive systems, or defense components.

Ordering springs made easy

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Trusted in aerospace and defense applications

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AEROSPACE INDUSTRY

Reliable spring solutions for demanding aerospace applications

Explore how Lesjöfors supports advanced aerospace engineering and modern aviation systems. Learn how we meet complex technical requirements for anti-spark performance, Electromagnetic Compatibility (EMC), Electromagnetic Interference (EMI) mitigation, and Magnetic Signature Reduction (MSR).

Learn more
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LESJÖFORS IN DEFENSE

Explore trusted spring and wire solutions for defense applications

Discover how Lesjöfors supplies custom mil spec springs for demanding defense applications. Learn how our components support critical performance in environments where failure is not an option.

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Other product types and custom solutions

Lesjöfors supplies a complete range of standard and custom products, from coil springs and wire forms to pressings and gas springs. If you have unique requirements, we also offer consultancy services, with engineers available to advise on materials, loads, and specifications. Contact us to discuss your requirements.

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