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Double Torsion Springs: Custom Options for Precision Use
Double torsion springs, as the name denotes, are springs comprised of two helical torsion coils instead of one. The two helical coil torsion coils have opposite wind directions that are joined by a segment of straight wire, known as the hairpin. Such a configuration enables the double torsion spring to provide bidirectional force and displacement control, as well as twice the torque output when compared to a single torsion spring.
Double torsion springs of various sizes are integrated into machine components where rotational precision and dynamic motion control in two directions are required. In such applications, they provide unmatched angular torque control and performance in safety-critical components found in industrial, automotive, and aerospace environments.
Century Spring is proud to supply these industries with high-quality, custom double torsion spring solutions tailored to the exact design specifications and operating environments of each application. All our wire form products are manufactured from premium materials using cutting-edge manufacturing techniques and high-quality control standards, ensuring reliability in the most demanding applications.
Explore Our Double Torsion Spring Options
Century Spring boasts a wide selection of customized double torsion spring design solutions, featuring numerous customization options, including Body Width, Angle between Legs, Hairpin Length, Spring Rate, and Number of Active Coils per side. We also provide fully customized solutions, built from scratch, to fit your specific application.
You can browse our full selection of stock helical coil springs by spring size, filtering by wire size, spring rate, and material, to view available options for custom double torsion springs.
Custom Double Torsion Springs
We provide unmatched custom spring design and manufacturing services for double torsion spring applications that require custom spring rates, tight dimensional tolerances, unique end configurations, exotic materials, and additional protective surface treatments.
Our team of spring design experts is ready to partner with you today to expedite the development of your custom, precision, double torsion springs. Our skilled engineers can assist you through all phases of product development, from initial concept design to final optimization, to create custom double torsion spring solutions tailored to your mechanism’s exact performance requirements and operational environment.
Our quality and inspection department features state-of-the-art torsion testing equipment, equipped with precision load cells that accurately measure torque and displacement values commonly required for double spring applications.
Don’t waste another minute; Request a Custom Quotation today!
Double Torsion Spring Manufacturing Capabilities
Century Spring combines state-of-the-art manufacturing tools with in-house design expertise to deliver custom solutions engineered to function reliably in compact assemblies and applications where precision performance and dimensional accuracy are driving requirements.
Our cutting-edge computational equipment includes CNC spring coiling machinery. Such capabilities enable us to manufacture high-quality double torsion springs, engineered to meet strict geometric tolerances and precision torque control, with extended operational lifetimes.
Our capabilities allow us to customize the following options for each side of your double torsion spring.
- Wire Diameter and Outer Diameters to fit any design envelope and torque requirement
- Number of Active Coils on each torsion coil to fit custom torque and displacement requirements
- Leg Length, Angle, and Style encompassing custom straight, offset, and hooked attachment configurations
- Wire Diameters for light-duty to heavy-duty applications
- Materials: Including music wire, stainless steel, and specialty alloys such as phosphor bronze
- Secondary Processes: Including heat treatments, shot peening, and corrosion-resistant surface coatings.
Finally, our Custom Manufacturing Services include extensive design for manufacturability (DFM) expertise and comprehensive prototyping and tooling assistance, enabling our customers to quickly test and refine their design solutions.
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Double Torsion Spring Information & Resources
Double Torsion Spring Applications
Double torsion springs are found in mechanisms and equipment across many industries. They are found in high-performance mechanisms that must accommodate rotation motion control in multiple directions, such as hinges, levels, and clamps. They are also found in compact mechanisms that require built-in safety redundancy.
Common applications of double torsion springs include automotive steering columns and window mechanisms, aircraft control systems, handheld surgical instrumentation, consumer electronics products, and power tools.
We are your trusted partner in developing double torsion springs for applications across the following markets.
How to Design or Specify a Double Torsion Spring
The most important design consideration when designing a double torsion spring is the spring rate, which is the torque required to displace the legs as measured in torque per degree.
After determining the working torque your double torsion spring must withstand, you can shop for standard torsion springs by the required spring rate to evaluate the other geometric properties needed to accommodate such torque control, such as the Wire Diameter and Outer Diameter (referred to as Body Diameter in torsion springs). The double torsion spring’s Hairpin Length defines the length of the bridge or curved portion of wire that connects the two bodies of the torsion spring (called the hairpin), as it extends outward perpendicularly from the center of the torsion spring axis. Conversely, the double torsion spring’s Hairpin Inner Diameter (ID) is the width of the hairpin as measured parallel to the main axis of the torsion spring coils.
Finally, other key geometric properties, such as Leg Length, Number of Coils, Angle between Legs, and Wind Direction, are also needed to accommodate the design envelope size and rotational load direction.
These parameters depend on the application's mounting requirements and desired rotation and torque control directions.
You should also consider the operational environment of your double torsion spring, including temperature, corrosion, and fatigue life requirements, to determine whether surface coatings or other secondary process operations are necessary.
FAQs About Double Torsion Springs
How does a double torsion spring differ from a standard torsion spring?
Standard torsion springs are single coils wound in one direction. In contrast, double torsion springs are two coils with opposite coil winds that are connected together via a segment of wire.
Can each coil in a double torsion spring be designed with different dimensions or leg angles?
Each coil within the double torsion spring can be configured with a different geometry as follows.
The Body Diameter (or Outer Diameter) of each of the double torsion spring coils can be wound into coils of different sizes with a differing number of coils (differing Body Length). They can also be bent into different end angles at the end of the double torsion spring.
However, it’s important to note that the wire diameter that is used to form the spring must be uniform for the entire double torsion spring.
How is torque calculated for a double torsion spring?
The total torque exerted is the sum of the individual resisting torques of each coil. The calculation for each torsion spring in the double torsion spring is denoted as:
Torque = Torsion Spring Rate (Torque per Degree) x Angular Displacement (degrees)
Where the angular displacement is measured at each of the legs of the coils, you can add together each of the resisting torque values on each of the double torsion spring coils to determine the total resisting double spring torque.
What are the typical Dimensional Tolerances for custom double torsion springs?
The exact expected tolerances for double torsion springs depend on the design and size of the double torsion spring. In general, tolerance values for torsion springs are a function of the body diameter-to-wire diameter ratio and are generally about ±10% for torque values and ±5% for diameter dimensions.
In which industries or applications are double torsion springs most commonly used?
Double torsion springs are used in mechanisms that require accommodating rotational motion and torque control in multiple directions. Such mechanisms include hinges, levels, and clamps, which must accommodate rotational motion in both directions. Common applications include automotive steering columns and window mechanisms, aircraft control systems, handheld surgical instrumentation, consumer electronics products, and power tools.
Why Choose Century Spring
Our Commitment to Quality and Service
As the most trusted name in spring manufacturing, Century Spring is a quality-first, ISO 9001-certified supplier of springs and wire-formed products, specializing in both stock and custom springs. With an established industry presence and a proven track record, our large-scale production facility enables us to maintain a large inventory of high-quality springs and wire form products.
We offer rapid delivery on over 40,000+ stock springs, available to ship today.
Our dedicated custom spring development and customer support teams understand how to navigate critical design criteria, including size, material, surface finish, and end type, to find the optimal spring solution for your application.
Our experienced product engineers, knowledgeable product quality team, and skilled manufacturing personnel consistently deliver the highest quality products to you faster than our domestic and international competitors because we understand your design scheduling constraints. Our products are always made in the USA.
Innovation and Customization in Spring Manufacturing
Century Spring’s custom design and manufacturing services combine state-of-the-art manufacturing tools with in-house design expertise to create custom double torsion spring solutions engineered to withstand any environment and meet the stringent component cleanliness and quality requirements for applications such as medical devices. We also offer prototyping services for custom double torsion springs, along with the capability to quickly scale to production quantities, minimizing total project development time.
Our cutting-edge computational equipment, simulation and testing techniques, including CNC compression self-monitoring and coiling machinery, enable us to deliver durable and reliable wire form products in a wide range of custom sizes and styles. We also have dedicated, high-speed machines that can quickly scale high-quality production to large part volumes.
Our team works alongside you to create, refine, and optimize spring designs to fit specific tolerance and performance design requirements.
Get In Touch
Contact Information
Contact us directly today, and let our experts resolve all your technical and sales questions. We can also guide you through both stock and custom micro and miniature spring design options for any spring application.
If you require immediate assistance, you can speak directly with our team on our dedicated customer service line at 800-237-5225.
Request a Quote and Consultation
You can always Request a Custom Quotation to partner with us in designing a custom spring solution if you can’t locate the spring you need within our extensive stock catalog.
We will follow up with a customized quotation and recommendations, and we will be happy to address any additional questions you may have.