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
Torsion Spring
Torsion Spring

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.

 

Torsion Spring Manufacturing Specifications

While we have listed some of the most common sizes, materials and manufacturing specifications, Newcomb Spring provides completely customized production on all torsion springs. If you don't see the torsion spring you need listed here, don't hesitate to contact us. Whatever your needs - Newcomb Kan-Do It!

Material Shapes & Sizes

  • .007 Inches to 2.0 Inches in Wire Diameter
  • Up to 2.0 Inches Bar Stock
  • Round Wire
  • Square Wire
  • Rectangular Wire
  • Special Section Wire
Torsion Spring Shapes and Sizes

Torsion Spring End Types

  • Bent
  • Hooked
  • Twisted
  • Looped to Suit Your Project Needs and Order Specification
Torsion Spring End Types

Common Torsion Spring Materials

  • Spring Steel
  • High Carbon Steel
  • Low Carbon Steel
  • Nickel Plated Carbon Steel
  • Stainless Alloys
  • Non-Ferrous Metals
  • Elgiloy®
  • Hastelloy®
  • Monel®
  • Inconel®
  • Titanium
  • and More
Torsion Spring Materials
 

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
M=
Ed4T / 10.8NtD
M=
Ebt3T / 6.6NtD
M=
Etb3T / 6.6NtD
M=
Ed4T /6.6NtD
S=
32M /πd3
S=
6M / bt2
S=
6M / tb2
S=
6M / t3

Key

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 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.

Torsion Spring Side View Diagram
Torsion Spring Diagram

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.

 

Torsion Spring Manufacturing Videos

 

This Spring Calculator will assist you with your spring calculations & stress checks.

Calculate Now

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