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Torsion Springs & Double Torsion Springs | Click to Watch the Manufacturing of a Torsion Spring or a Double Torsion Spring  |
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Contact us today, or request a torsion spring manufacturing quote online. Experience the Newcomb Spring difference. |
With ISO 9001 certified quality systems, Newcomb Spring offers eight manufacturing plants and a special facility focused on the needs of our customers in Mexico and Latin America. We are ready to manufacture the torsion springs that you need.
As a leading torsion spring manufacturer, our capabilities for these coil springs can fill almost any customer need, from a simple straight leg or a close wound spring to a unique example of a double torsion spring, where one right coil section and one left coil section are connected and work in parallel.
Formulas & Manufacturing Specifications
Winding
A torsion spring can be closed- or open-wound and usually is designed to wind up. As a torsion spring winds up, the coil diameter will decrease and the body length will increase. Read more on the direction of spring winding in our technical articles.
Spring Load
It is important to consider the direction of loading when designing bends or forms off a spring's body or in spring legs. Favorable residual stresses can be created when bends are loaded in a direction that reduces the radius or curvature.
Design
With new manufacturing techniques, torsion end positions can be held to surprisingly close tolerances. Older-design free angle tolerances often do not apply. Newcomb is a torsion springs manufacturer whose facilities employ modern forming machinery and production techniques that allow for an infinite variety of torsion spring end shapes. When specifications call for very long spring legs, we recommend discussing your requirements with a Newcomb sales engineer. Our staff can verify manufacturing capabilities and will work to keep your production costs as low as possible.
| Basic Design Formulas for Torsion Springs Note: The constants 10.8 and 6.6 generate results close to actual versus other theoretical values. |
| Formula | Round Wire | Rectangular Wire Wound on Flat |
Rectangular Wire Wound on Edge |
Square Wire | ||||||||
| Moment or Torque, M = |
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| Bending Stress, S = |
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| D = Mean Coil Diameter (in. or mm) d = Diameter of Round Wire (in. or mm.) Nt = Number of Coils E = Modulus of Elasticity (psi or MPa) T = Deflection, number of turns or revolutions of spring |
M = Moment or Torque (lbin or Nmm) b = Width (in. or mm) t = Thickness (in. or mm) S = Bending Stress*, (psi or MPa) *(Typically the maximum design stress is 75% of the minimum tensile strength of the material.) |
The Affects of Spring Ends & Installation 
The type of ends and installation affect spring load and deflection, as shown in the diagram, in which Point (A) rotates in an arc about the center of the shaft. All torsion springs have 3 or more points of contact with at least two at the ends and one at the arbor.
Order Information
As with all Newcomb Spring-produced parts, we can custom manufacture any torsion spring to fit your needs. We have offered great prices, high quality and total customer satisfaction for more than a century.
Contact us today, or request a torsion spring manufacturing quote online, and experience the Newcomb Spring difference for yourself.
As a leading torsion spring manufacturer, Newcomb Spring is a founding member of the Spring Manufacturer's Institute. Some content here has been used with permission of the SMI.