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Flat springs

When space is limited, you still need reliable force. Flat springs store energy through deflection and release it with predictable, stable performance, making them ideal for compact, simple assemblies.

At Lesjöfors, we design and manufacture flat springs with accuracy and repeatability in mind. Using high-grade spring steels and other performance materials, our team meets strict specifications for strength and durability. From manual processes to full automation, and with protective finishes available, every flat spring is built to perform in demanding applications across multiple industries.

Discover our flat spring solutions

  • A shiny, gold, flat spring with one small hole, set against a white background. The smooth surface reflects light, creating a luxurious feel.

    Constant force springs

    • Stable, consistent pull from engineered strip geometry
    • Flexible installation for partial or full extension
    • Wire and coil dimensions tailored to specification
    • Materials include stainless steel & spring steel with protective finish
    Explore constant force springs
  • A metallic, spiral-shaped flat spring set against a white background, with smooth surfaces and sleek edges.

    Power springs

    • Strip thickness up to 2 mm depending on design
    • Steady torque and smooth retraction over multiple cycles
    • Conventional, pre-stressed, and cross-curved types available
    • Materials include stainless steel & carbon steel with protective finishes
    Explore power springs
  • A sleek, metallic flat spring rests on a white background. The spiral is tightly coiled with smooth, reflective surfaces.

    Spiral torsion springs

    • Cold formed up to 5 mm, hot formed up to 12 mm
    • Designed for smooth, repeatable rotational torque
    • Suitable for winding, balancing, and return mechanisms
    • Materials include spring steel, stainless steel, and alloys
    Explore spiral torsion springs
A person in a yellow shirt operates a blue lathe machine, focusing intently on adjusting a metal component, highlighting precision and craftsmanship.

Leading flat spring manufacturers

As a trusted flat and flat wire spring manufacturer, Lesjöfors delivers reliable, precision-engineered components worldwide.

Designed for stable, repeatable force in demanding environments, each spring is produced under strict process control and tested for fit, function, and fatigue.

Controlled bending geometry and precision heat treatment ensure consistent performance, strength, and long fatigue life – backed by certified global quality systems including ISO 9001, ISO 14001, and ISO 45001.

More about Lesjöfors
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Pushing the boundaries: precision manufacture of flat springs​

Flat springs are essential to precision, reliability, and performance across countless applications.

At Lesjöfors, we collaborate with engineers and product teams to develop custom flat spring solutions, combining advanced manufacturing with materials expertise and global scale.

Innovation starts with partnership. Let’s shape what’s next, together.

 

Contact our expert team
A person wearing black gloves holds up a flat spring, distorting their face behind it. The background is an industrial setting with blurred lights.

Custom flat spring design & production

Lesjöfors specialises in custom flat spring design, offering tailored solutions for unique requirements across industries such as electronics, medical, aerospace & defense and the automotive aftermarket. With over 40 years of flat spring expertise, we offer engineering support from concept and prototyping to production, delivering high-performance custom products that meet the highest standards of quality and reliability.

Many projects demand a precise load-deflection curve, along with the right fit and finish. As a custom flat spring manufacturer, our engineers design springs to match your specific force, travel, space, and assembly requirements. 

We select the right material and treatment for each design. Production scales from manual to fully automated, keeping lead times short and quality consistent at any volume.

We work with a variety of metals and alloys, including:

  • Flat spring steel for high strength and reliable bending
  • Stainless steel for corrosion resistance and durability
  • Nickel and copper alloys for specialized environmental requirements
  • Surface treatments to improve fatigue life, stiffness, and corrosion protection
  • Production methods range from manual to fully automated, with tight quality control

Flat springs for industry applications

Lesjöfors supplies high-performance flat springs to demanding sectors. We combine innovation, quality, and global service to meet exact specifications.

Our cases

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LESJÖFORS IN AEROSPACE

Engineering precision for mission-critical aerospace applications

Explore how our flat springs are used in landing gear, flight controls, aircraft doors, and safety systems, delivering performance, durability, and accuracy in demanding aerospace environments.

Learn more
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LESJÖFORS IN MEDICAL

Co-creating the future of medical devices for the healthcare industry

Our flat springs support injectors, glucose monitoring systems, and critical medical equipment. Learn how our spring technologies enhance safety, reliability, and performance across healthcare applications.

Learn more

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