Torsion Spring

Torsion Springs
& Double Torsion Springs

  • .007 to .625 Inches In Spring Wire Diameter
  • Up to 2.0 Inches Bar Stock
  • Custom Torsion Spring End Options to Meet Your Needs
  • Round, Rectangular, Square & Special-Section Wire

Torsion Spring 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 torsion spring's body or in torsion spring legs. Favorable residual stresses can be created when bends are loaded in a direction that reduces the radius or curvature.

Design of Torsion Springs

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 with modern forming machinery and production techniques that allow for an infinite variety of torsion spring end shapes. When specifications call for very long torsion 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.

Round Wire Rectangular Wire
(Wound on Flat)
Rectangular Wire
(Wound on Edge)
Square Wire
Ed4T / 10.8NtD
Ebt3T / 6.6NtD
Etb3T / 6.6NtD
Ed4T /6.6NtD
32M /πd3
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.)



Torsion Spring Diagrams

Torsion Spring Diagram

Torsion Spring Diagram

Torsion springs are used to store rotational energy or to apply torque. It is always best to design torsion springs to wind up in use and to apply force in the direction of the wind – otherwise unfavorable bending stresses will occur. As a torsion spring deflects in the direction of the wind, the spring’s diameter will decrease and its body length will increase. In these situations it is recommended that the torsion spring be supported on its inner diameter (I.D.) with a shaft or tube, sized so that there will be no binding as the torsion spring deflects.

Double-torsion springs are a common type of torsion spring. They are made of a left hand component and a right hand component which are connected at the center. It is possible to have the two components connect at the outside edge, though this is not recommended.

Most torsion springs are wound with the coils touching but with minimal initial tension. For these springs the body length can be calculated by multiplying the wire diameter by the number of coils, then adding one. View our Torsion Spring Gallery.



TORSION SPRING & Double Torsion Spring VIDEOS

Torsion Spring Variations

Torsion Spring Order Information

As with all Newcomb Spring-produced parts, we can custom manufacture any torsion spring or double torsion spring to fit your needs. As a trusted torsion spring manufacturer, we have offered great prices, high quality and total customer satisfaction for more than a century.

To experience the Newcomb Spring difference for yourself, contact us today, or request a torsion spring manufacturing quote online.

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