Torsion Springs

Torsion Spring Manufacturing

As one of the most experienced and versatile torsion spring manufacturers in the United States, our torsion springs can be made in a variety of wire diameters and shaped. Our production capabilities also support most bend types and orientations in the diameters below.

• Single torsion springs in wire diameters from: .008"-.625"
• Double torsion springs in wire diameters from: .008"-.236"
• Wire shapes: standard, rectangular, and square

About Torsion Springs

What Is a Torsion Spring?

A torsion spring is a type of coiled spring that exerts a twisting force, or torque, along a central axis. Depending on the application, torsion springs can be designed to work in a clockwise or counter-clockwise rotation, thus determining the direction of the wind.

MW offers a selection of stock and standard torsion springs with legs of equal length oriented at varying unloaded angles, as well as custom torsion spring manufacturing.

How Do Torsion Springs Work?

Torsion springs work by storing and releasing angular energy or statically hold a mechanism in place by deflecting the legs about the body centerline axis. They offer resistance to twist or rotationally applied force. A spring of this type will reduce in body diameter and increase slightly in body length when deflected in the preferred direction of the fabricated wind.

Torsion Spring Applications

Torsion springs are used in a wide variety of applications. Some of the most common include garage door torsion springs and door hinge torsion springs. Other uses may include clothes pins, levers, and clocks as well as use in the automotive, medical, and industrial manufacturing industries.

Single vs Double Torsion Springs

There are single body torsion springs and double body torsion springs. A single body torsion spring has one core coiled area with two ends. A double body torsion spring has two coiled areas connected by a bridge. Each body in a double torsion spring has one end that can be tailored to individual needs.

Double torsion springs have a number of advantages over single torsion springs, including greater strength and the ability provide more force. They are frequently used in

Single body torsion springs are common across manufacturers, but it is rare to find a double body torsion spring manufacturer. MW offers both single and double body torsion springs.

Torsion Springs Design Considerations

The torsion spring configuration is designed for the purpose of storing and releasing angular energy or for the purpose of statically holding a mechanism in place by deflecting the legs about the body centerline axis. A spring of this type will reduce in body diameter and increase slightly in body length when deflected in the preferred direction of the fabricated wind.

When designing a torsion spring, it's important to consider your application and whether you will need round, rectangular, or shaped wire, such as square wire. The simplest and most common torsion spring designs are single body torsion springs made from rectangular wire with straight ends, although this design format can be modified with bends and formed shaped.

The direction of the fabricated wind can also be important for torsion spring applications due to the leg bearing/attachment location having to be on the left or right side upon assembly. A torsion spring is normally supported by a rod (mandrel) that is coincident with the theoretical hingeline of the final product.

Double torsion spring designs are more complex and will need to consider manufacturing method. Double torsion springs are coiled from the center, as opposed to single torsion springs, which are coiled from the ends. For details on torsion spring design for both single and double body torsion springs, reach out to our engineering team through our Ask an Expert form.

Torsion Spring End Types

Like other coiled springs, torsion springs can have a variety of end types depending on the application and industry they're used in. Some of the most common end types include straight, hook ends, and hinge ends. Custom or specialty ends can also be produced by custom torsion spring manufacturers like MW Components.

Typical Torsion Spring Tolerances

Tolerance values for torsion springs depend on the body-diameter to wire-diameter ratio and are about +/- 10% in torque and +/- 5% in diameter.

Torsion Spring Dimensions: How to Measure a Torsion Spring

Correct dimensions are crucial in identifying the right spring for your application. Use the steps and diagram below to measure accurately measure your torsion springs.

1. Hold the spring in one hand, and the calipers in the other hand.
2. Place the caliper “teeth” on the inside diameter. This is called the Inside Diameter (I.D.).
3. Place the calipers on the “leg” to measure the wire. This is called Material Size (or Wire Diameter).
4. Place the calipers on the working coils of the spring. This is called the Body Length. Place the calipers on the working coils of the spring. This is called the Body Length.
5. Count the total coils, beginning at one end, just under where the leg leaves the body. Count to the other end, all full coils, and any fraction thereof. This is called the Number of Coils and determines leg position. i.e. 90°, 180°, etc.
6. Determine the direction of the coil (Wind Direction). See diagram for hand/finger illustration. Right Hand Wind or Left Hand Wind.

Torsion Spring Resources

Visit our resource center to see tips and tricks for how to design and engineer torsion springs and other MW Components parts.