Torsion Springs

Torsion springs store and release rotational energy and are used in hinges, levers, counterbalances and latching mechanisms. More than 350 standard sizes with different wire diameters, coil diameters and leg angles. Every spring is listed with full technical data. Use the filters or ask Springy to find the right spring, or contact us if you need a custom torsion spring.

Outer diameter Do (mm)
Wire diameter d (mm)
Max. torque Md (Nmm)
Max. angle α (°)
Leg position
Winding direction
Max. mandrel M/S (mm)
Leg length E (mm)
Active coils n
Torsion spring dimensions
DoOuter diameter of the unloaded spring body. It decreases when the spring is loaded in its winding direction.
dWire diameter. Affects torque, installation space and load capacity.
MdHighest specified torque, reached at the max. deflection angle α.
αMax. intended angle between the unloaded and the loaded position.
M/SMax. recommended diameter of the guide mandrel or shaft.
ELength of the straight legs.
90-360°Leg position: angle between the two legs when unloaded.
Part No. Do (mm)i d (mm)i Md (Nmm)i E (mm)i Leg position Material Stock Price Ex. VAT
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How to select a torsion spring

1
Torque and lever arm

Work out the force needed and the effective lever arm. The required torque is force × lever arm. Compare it with Md.

2
Angle and leg position

Determine the angle between the unloaded and the fully loaded position (max. α) and choose the leg position that suits your contact points.

3
Winding direction

Choose right-hand or left-hand so that the spring tightens under load and its diameter decreases.

4
Installation space

Check the outer diameter Do, the leg length E and the axial length, and make sure the mandrel is not larger than M/S.

Material

Stainless steel 1.4310
Stainless spring steel with good spring properties and increased corrosion resistance for many industrial applications. May be slightly magnetic due to cold forming. Check suitability separately for permanent exposure to seawater, chlorides, acids or aggressive cleaning agents.

Torque and lever arm

Md is a torque, not a force. The force at the leg depends on the distance r between the spring axis and the point where the force is applied:

F = Md ÷ r

At the same torque, a longer lever arm gives a lower force. The leg length E is not necessarily the effective lever arm. Md and α are linked: the stated torque is reached at the stated angle. In dynamic applications, use a clearly lower working torque for a long service life.

Installation and guidance

Torsion springs are normally guided over a mandrel, shaft or pin that must not be larger than M/S. Leave enough radial and axial clearance, as the diameter decreases and the spring body gets longer under load. For reliable operation:

Do not shorten, bend, weld or heat the legs without a technical assessment.