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Flat Springs

Spiral torsion springs

Spiral torsion springs, also known as clock springs, are tightly wound flat springs designed to store and release rotational energy within limited spaces. Unlike traditional round-wire torsion springs, these springs are made from flat strip material coiled in a spiral shape, allowing high torque output within a compact design.

At Lesjöfors, we design and manufacture spiral torsion springs for precision-controlled motion and return mechanisms. Available in a range of materials, sizes, and torque capacities, our clock springs offer dependable performance in demanding applications across multiple industries.

Technical specifications

Materials:

Various materials, including carbon steel, stainless steel, and specialty alloys, are available for spiral torsion spring development projects or prototypes. Each metal provides the following distinct advantages:

• Carbon Steel: Widely used for engineering springs, carbon steel may require pre-galvanized coatings or additional corrosion protection.
• Stainless Steel: Stainless steel exhibits excellent heat and corrosion resistance properties and is an essential metal alloy for manufacturing spiral torsion springs.
• Speciality Alloys: Metals such as chromium alloys and cold-drawn nickel are best suited for applications requiring high corrosion resistance when exposed to extreme temperatures.

Wire diameter:

Using strip measuring from 0.002” to 0.170” thick and from 0.125” to 3” wide

Force:

Between 0.02 in-lb up to 700 in-lbs of force

A sleek, metallic flat spring rests on a white background. The spiral is tightly coiled with smooth, reflective surfaces.

Find the right spiral spring solution - standard or custom

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Four spiral torsion springs of varying sizes and colors, including silver and black, stand upright on a white background, showcasing their tension and flexibility.

What are spiral torsion springs?

Spiral torsion springs, or clock springs, are flat coil components that store and release rotational energy in a compact design, delivering torque where space is limited.

Commonly used in automotive, aerospace, medical, electronics, and industrial applications, they provide smooth, controlled motion in mechanisms like seat adjusters, cable reels, and timers. 

 

Product range & stock availability

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Stock spiral torsion springs

At Lesjöfors, we supply a comprehensive range of stock spiral torsion springs in various materials, sizes, and torque capacities to suit any application. As a leading global spring manufacturer, we combine fast, reliable delivery with local technical support and expert guidance, ensuring you get the right solution when you need it.

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Close-up of numerous spiral torsion springs, creating a pattern of spirals and curves. The image conveys complexity and texture.

Custom spiral torsion springs

Many applications have unique torque and motion requirements, and our custom spiral torsion springs can be designed to meet them with precision. We work with you to define torque range, rotation angle, material, and mounting style to ensure the best fit.

As a trusted clock spring manufacturer, Lesjöfors delivers tailored solutions designed for accuracy, durability, and long service life — all supported by our global engineering expertise and fast, reliable distribution network.

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Advanced spiral torsion spring manufacturing​

Our spiral torsion springs are engineered to deliver precise and consistent torque in demanding applications. Each spring is manufactured with advanced forming and heat treatment processes, ensuring high fatigue strength, dimensional accuracy, and long service life.

Key technical features include:

  • Precision winding and tension control for consistent torque performance
  • Cold forming up to 5.00 mm and hot forming up to 12.00 mm
  • High-quality spring steels and stainless steels for strength and corrosion resistance
  • Certified quality standards: ISO 9001, ISO 14001, ISO 45001
Close-up of a black spiral torsion spring, creating a hypnotic pattern. The glossy surface and circular design convey a sense of motion and precision.

How do spiral torsion springs work?

Spiral torsion springs work by building tension as they’re wound and releasing it when they unwind. This stored energy produces a steady, controlled rotary motion. The more the clock spring is wound, the more torque it delivers, making them ideal for devices that need consistent, precise rotation.

 

 

 

Illustration of a spiral torsion spring, annotated with dimensions: outer diameter (OD), arbor diameter (A), width (w), and material thickness.

Spiral torsion spring ​materials

We manufacture spiral torsion springs in a range of materials and finishes to meet specific performance, environmental, and durability requirements. Each spring is expertly designed to deliver powerful torsional force, with an open coil design that minimizes friction for optimal performance when correctly installed. 

Our standard clock springs are made from high-quality stainless steel with rounded edges, ensuring long-lasting strength, accuracy, and reliability. Typical materials include 301 and 302 stainless steel, 1074 and 1095 cold rolled high carbon steel, and Inconel.

Common materials and finishes include:

  • High-tensile spring steel for reliable torque and fatigue resistance
  • Stainless steel for maximum durability in corrosive or high-moisture environments
  • Hardened and tempered carbon steel for applications requiring high strength and precision

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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