Custom Torsion Spring Manufacturing - Ace Wire Spring & Form

Double Torsion Springs

Double torsion springs feature two connected coils—one right-hand and one left-hand—working in parallel to deliver balanced, high-torque performance. Designed to minimize friction and maximize rotational force, these springs are ideal for precision applications that require smooth and controlled movement.

Explore our double torsion spring capabilities by visiting our Other Spring Types page.

Large Diameter Torsion Springs

Ace Wire Spring & Form Co., Inc. specializes in large-diameter torsion springs, engineered for high-torque applications in agriculture, power generation, trailers, and liftgate systems. Our state-of-the-art manufacturing equipment allows us to produce heavy-duty torsion springs with exceptional durability and performance, even in demanding environments. With our advanced machinery and expert engineering team, we can customize torsion springs to meet your exact specifications, ensuring reliability and longevity for your application.

Torsion Springs for Trailers and Liftgates

Ace Wire Spring & Form Co., Inc. specializes in manufacturing high-performance torsion springs for trailers and liftgates, engineered for durability and reliability in heavy-duty applications. Our trailer torsion springs are designed for ramp and gate lift assist, providing the necessary torque to ensure smooth, controlled operation when raising and lowering trailer gates. We also produce large-diameter torsion springs for heavy-duty equipment trailers, utility trailers, and enclosed cargo trailers, ensuring safe and efficient loading and unloading.

In addition to trailer applications, we manufacture torsion springs for liftgates, commonly used in work trucks, delivery vehicles, and loading dock lift systems. These springs play a critical role in counterbalancing liftgate mechanisms, enabling seamless lifting and lowering of heavy cargo. Whether in logistics, freight transport, or material handling, our liftgate springs are built to withstand repeated use while maintaining optimal performance.

As a certified member of the National Association of Trailer Manufacturers (NATM), Ace Wire Spring & Form Co., Inc. adheres to the highest industry standards. Our team of expert engineers works closely with customers to develop custom torsion springs tailored to specific load requirements, ensuring maximum efficiency and longevity. From initial design and prototyping to full-scale production, we are committed to delivering precision-engineered torsion springs that exceed industry expectations.

Custom Services & Finishes

Take a moment to explore the variety of additional services Ace Wire Spring & Form Co. Inc., can perform on any type of spring or wire form to enhance performance and durability. From heat treatment, deburring, and painting to many more offerings, our secondary services are designed to meet your specific needs. Please include the secondary services you would like to add in the comment section of your request for quote, and our engineers will return an accurate and timely quotation with the added services. Visit our Secondary Services Page to learn more.

To review springs and wire form finishes such as e-coating, zinc plating, passivation, and many more, visit Wire Size and Material Range Page.

Optimized Supply Chain & Custom Manufacturing Solutions

At Ace Wire Spring & Form Co., we provide flexible and reliable solutions to meet your manufacturing needs. Our expertise ensures precision, quality, and efficiency from prototype to production. For more details on these value-added services, visit our Custom vs. Stock Springs Page.

Prototyping & Samples – We offer rapid prototypes and sample production to help finalize your designs before full production.
Quality Compliance – We accommodate industry-specific quality requirements, including certifications and compliance documentation.
Quantity Break Pricing – Volume-based pricing options help you optimize costs for larger production runs.
Flexible Blanket Order Programs – We work closely with customers to schedule shipments as needed, ensuring a steady and reliable supply chain.

Design Specifications

Torsion Springs and Double Torsion Springs Design Considerations

After determining the force of torque required a designer usually estimates a suitable space or size limitations. The space should be considered approximate until the wire size and number of coils have been determined. The wire size depends solely on the torque.

Torsion Springs and Double Torsion Springs Specifications

When ordering a torsion springs or double torsion springs spring remember to give the following information as completely as possible:

Inside or Outside Diameter.
If spring works on a rod, give size of same, as spring must not bind when wound up to its limit of travel.
Free length and number of coils. If spring cannot increase in length as wound up, allow sufficient space between coils.
Right or Left Hand Wound.
Wire Size. Decimal size if possible. Material, Kind and Grade.
Style of Ends, (see illustrations). Number of turns deflection to hold given load and radius of loaded arm. This length may be the length of the arm, or the arm may be attached to a movable machine member, in which case the length to point of application of load is given.
Finish, Plain unless otherwise specified.

Torsion Springs – Double Torsion Springs Design Hints

Proportions: Spring index, inside diameter divided by wire diameter between 4 and 14 is best. The larger the ratio the more the average tolerance. Ratios of 3 or less often cannot be coiled on spring coiling machines because of arbor breakage.

Spring Index: Spring index must be used with caution.

Total coils: Torsion springs with less than 3 coils buckle and difficult to test. Best to specify to the nearest fraction in eights or quarters whenever possible.

Rods: Torsion springs should be supported by a rod running through center.

Diameter Reduction: Should compute the reduction of inside diameter during deflection. Double Torsion Springs Allowances should be considered for normal spring diameter tolerances.

Winding: Coils of a torsion spring may be closely or loosely wound. Should not be wound with coils pressed tightly together. Tight-wound springs with initial tension in coils do not deflect uniformly and are difficult to test accurately. A space between 20 to 25 percent of wire thickness is desirable.

Hand: Hand or direction of coil should be specified. Deflecting the spring in an unwinding direction causes high stress and early failure. When spring is sighted down the longitudinal axis it is right hand when direction of wire into spring takes clockwise direction or angle of coils follow angle similar to threads of bolt or screw, otherwise it is left hand. A spring must be coiled right hand to engage threads of a standard machine screw.

Arm Length: All wire in a torsion spring is active between the points where the forces are applied. Deflection of long extended arms can be calculated by allowing one third of the arm length from the point of force contact to the spring body converted in coils. If the length of arm is equal or less than one half the length of one coil it can be safely neglected in most applications.

Bends: Arms should be straight as possible. Sharp bends are stress raisers that cause early failure. Bend radii should be as large as practicable. Hooks tend to open during deflection. Hook stresses can be calculated in the same way as for extension springs.

Double Torsion: Consistence of a left-hand-wound series of coils and a series of right-hand-coils connected at center. Torque and stress calculations, each series is calculated separately as individual springs, then torques are added together but deflection are not added together.

Torsion Springs Design Formulas and Specifications

The basic formulas for torque or Moment (M) and bending stress (S) used in designing torsion springs are shown below.

In the formulas the constants 10.8 and 6.6, while strictly theoretical, give results closer to the actual values obtained.

Torsion Springs Videos

This video shows how Torsion Springs are manufactured.

For more information about torsion springs or to talk to one of our experts call 1-800-828-3353.

Manufacturing Torsion Springs

Ability to build quality and tailor product
Can be made out of carbon steel or stainless steel.
Assists when lifting heavy lids or components

Ace Advantage

ACE specializes in custom precision springs and wire forms, offering a distinct advantage by utilizing the most advanced spring design software. ACE validates each existing and new design, notifying the customer with our recommendations.

Benefits of Torsion Springs

Ease of adjustment in applications
Ability to fit inside small applications
Design makes it durable

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Torsion Springs