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torsion springs

Torsion & Double Torsion Springs
Torsion springs often are suited to situations where torque is applied from two directions, as they are designed to offer resistance to externally applied pressures. Torsion refers to the twisting action of the coils, although the wire itself is subjected to bending stresses rather than torsionally applied stresses. These springs perform at a maximum when supported over a tube or rod.

 
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.
 

Common Manufacturing Specifications
While we have listed some of the most common sizes, materials and manufacturing specifications, Newcomb Spring provides completely customized production on all parts. If you don’t see the part you need listed here, don’t hesitate to contact us. Whatever your needs – Newcomb Kan-Do It!

Material Shapes
& Specifications
  • .004 inches to 2.0 inches in diameter
  • round wire
  • square wire
  • rectangular wire
  • special section wire
End Types
  • bent
  • hooked
  • twisted
  • looped to suit your project needs and order specification
Materials
  • spring steel
  • high carbon steel
  • low carbon steel
  • nickel plated carbon steel
  • stainless alloys
  • non-ferrous metals
  • elgiloy
  • hastelloy
  • monel
  • inconel
  • titanium

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 precision springs and metal form parts 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 =
Ed4T

10.8NtD
Ebt3T

6.6NtD
Etb3T

6.6NtD
Et4T

6.6NtD
Bending Stress,
S =
32M

π d3
6M

bt2
6M

tb2
6M

t3
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 Torsion Spring Diagram
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 125 years.

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.