Where it earns its place
Best-Fit Uses
Hinged lids, flaps and small doors
Assists opening or closing around the same pivot used by the moving part.
Pedal, lever and clamp return
Applies turning force through simple straight contact arms.
Returning a lever or hinged part
Provides a turning force around a pivot so a moving arm comes back toward a preferred angle.
Helping open or close a panel
Can assist or oppose rotation when the spring is arranged around the same pivot as the moving part.
Why this style works here
What This Spring Style Solves
Straight legs are easy to locate against simple features and are often the cleanest torsion-spring interface for hinges, pedals and levers.
Before you choose it
What to Confirm in Your Assembly
- Provide the shaft or mandrel diameter and available clearance around the coil.
- Show free leg angle, working angles and which leg moves during loading.
- Show the pivot or shaft diameter and the free and working leg positions.
- State the required torque at one or more angles and the direction in which the spring is loaded.
- Identify which leg or end is fixed and which one moves with the assembly.
Avoid forcing the wrong spring into the design
When Another Spring Style May Fit Better
The spring should be loaded in its intended winding direction. Reversing the direction can open the coil, change how it fits the shaft and produce a different stress condition.
- Single-leg torsion springs for one-sided interfaces
- Double-leg torsion springs for paired arms
- Extension springs when a pull linkage is easier to package
Keep material selection separate
Environment & Material Direction
Once the working angle, torque and fit around the pivot are known, use the Materials section to choose an alloy for corrosion, temperature or fatigue needs.
For the material families represented in this product's reference configurations, compare Carbon & Alloy Spring Steels, Copper Alloy Spring Materials, Nickel & High-Temperature Spring Alloys, Stainless Steel Spring Materials. Confirm the exact grade and condition for your assembly.
Move from the use case to the specification
Where to Go Next
Related Spring Design Guides
Review the dimensions, working loads and drawing requirements for this spring family.
Engineering Guides for This Product
These guides contain material, wire-diameter or standard data related to this product.
Application questions
Frequently Asked Questions
Does the torsion-spring coil need to fit tightly on the shaft?
No. Clearance is normally needed so the coil can move without binding as it winds. The shaft size and expected change in coil diameter should both be considered.
Why does winding direction matter?
A torsion spring is normally intended to tighten around its axis as it is loaded. Reversing that direction can open the coil, change the fit around the shaft and produce a different stress condition.
What should I send for an application review?
Send the assembly drawing or a clear sketch, the working positions, the force or torque you need, expected cycles, environment and quantity. If an existing spring is being replaced, include its dimensions and explain what is not working well in the current design.
Same application family