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Torsion Springs

Torsion springs can be made from round or square wire, although round is considerably cheaper and easier to manufacture. We keep a vast selection of material sizes and types in stock, from standard spring steels to nickel alloys, all of which can be used to manufacture torsion springs.

Complex Triple Torsion Spring

When ordering a torsion spring, consider the following factors:

Wire size - Specify either metric or Imperial measurements or Standard Wire Gauges. We stock all the standard wire sizes and also a large range of non-standard wire sizes for certain designs.

Diameter - Specify the outside diameter of the main part of the spring, or the size of rod that is to go through the centre of the spring (if any). The diameter of the spring is inversely proportional to the rate (strength) of the spring.

Torsion Spring

Number of coils - The number of coils is inversely proportional to the rate (strength) of a torsion spring. A large number of coils will result in a fairly weak spring. A small number of coils will give a relatively strong spring.

Rate - The rate (strength) of the spring depends on the above factors and can easily be calculated. The rate is defined as the torque that has to be applied in order to produce unit deflection and is usually measured in  Newton mm per degree (Nmm/°).

Torsion Spring

Leg Types - The following are just four examples of leg arrangements for torsion springs:

Axial legs. Tangential legs.
Axial legs. Tangential legs.
[ example ]
Radial legs. One radial, one tangential.
Radial legs.
[ example ]
One leg radial over centre,
the other tangential.

There is no standard type of leg configuration for torsion springs although, obviously, the cost to manufacture will increase as the complexity increases. The simplest (and cheapest) type are the tangential legs, but we are able to manufacture just about any design you could imagine with multiple bends and/or hooks and loops. Feel free to contact us to discuss any specific requirements.

Index - This is the ratio of the mean diameter to the wire diameter. A low index indicates a tightly wound spring: a relatively large wire size wound around a relatively small diameter mandrel giving a high rate. A high index indicates a more loosely wound spring: a relatively small wire size wound around a relatively large diameter giving a low rate.

Photo: Torsion Spring

Stresses - Torsion spring stresses are of great importance. We are able to calculate the stresses within the spring and warm our customers what the maximum safe deflection is to prevent damage to the spring during operation. For more technical information contact our design team.

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