Applications
Where this spring style fits
Review best-fit uses, assembly constraints and situations where another spring style may be a better choice.
View application guidance →Torsion Springs
Custom Internal / Concentric Double Torsion Springs
Concentric or internally arranged paired torsion enquiries, defined by the inner and outer coil layout and the actual rotational load path.
- Specification
- Drawing and working requirement
- Dimensions
- Confirmed for the assembly
- Performance
- Specified at working positions
- Quotation
- Submit dimensions and quantity
About Custom Internal / Concentric Double Torsion Springs
For an internal or concentric paired torsion requirement, begin with an assembly section showing the position of each coil relative to the common support axis. The product name does not define whether the elements move together or independently. Inner and outer bodies, legs and supports need separate dimensions. Review clearances and torque-angle targets for the specified arrangement rather than assuming a side-by-side double spring is equivalent.
Key Design Characteristics
- Show the inner and outer elements in an assembly section.
- Identify support surfaces and the attachment of each leg.
- Define whether the elements operate together or through separate movements.
Choosing Between Related Designs
An external parallel arrangement places the bodies beside each other. Use a concentric specification only when the assembly drawing establishes that layout. Compare support and clearance requirements before selecting a paired arrangement.
Specification and Inspection Review
Define the measurement fixture and angular references for each element. Inspection should address mutual clearance through the working movement and the actual torque transfer at the defined leg contacts.
Product Specification
What to Define for This Spring
Use these product-specific inputs to describe your requirement. Final dimensions, material and performance are confirmed against the drawing and operating conditions.
| Specification item | What to define |
|---|---|
| Concentric envelope | Inner and outer coil dimensions, widths and separation. |
| Support interfaces | Shaft, sleeve or housing dimensions and contact regions. |
| Leg geometry | Individual leg forms, free positions and attachment points. |
| Torque and angle | Required torque for each element or the combined assembly. |
| Movement clearance | Rotational limits, axial space and permissible contact. |
Next Design Decisions
Next Steps for Your Spring Design
Once the spring style is selected, confirm how it works in the assembly, which material suits the environment, how it will be manufactured and which dimensions and performance points should be controlled on the drawing.
Materials
Choose the material for the environment
Review material and surface condition for each element, particularly where the proposed layout could introduce contact between coils or supports.
Compare spring materials →Manufacturing
Plan prototype and production
Review forming, heat treatment, secondary operations, inspection and the path from first samples to repeat production.
View manufacturing capabilities →Engineering Data
Use the engineering guide for design support
Use the engineering library to review materials, sizing considerations and applicable standards for the custom design.
Open Spring Engineering Guide →Material Direction
Common Material Families to Review
The links below are selection guides, not a claim that every grade is suitable for every size or load.
Related Spring Design Guides
Review the design and measurement requirements for this spring family.
Compare Designs
Related Spring Products
Use these alternatives when the available space, connection style, travel or force direction changes.
Torsion Springs
External / Parallel Double Torsion Springs
Side-by-side double torsion spring layouts, specified by coil spacing, bridge geometry, winding direction and torque at working angles.
Torsion Springs
Double Torsion Springs
Custom Double Torsion Springs manufactured to your drawing, dimensions, load or torque, material, working environment and production requirements.
Torsion Springs
Double-Leg Torsion Springs
A torsion spring with two working arms used to share rotary load across a wider mechanism or provide balanced return around a common pivot.
Product Questions
Internal / Concentric Double Torsion Springs FAQ
Does double torsion always mean concentric coils?
No. Common double-torsion layouts can place bodies side by side. A concentric requirement needs its own assembly section and support specification.
Can both elements be specified with one free angle?
Only if the drawing defines that shared reference. Otherwise state the free and working positions of each element separately.
RFQ
Send the Working Requirement
A drawing is ideal. If you do not have one yet, provide the dimensions, load or torque, travel, environment and expected quantity that matter in the assembly.
CustomSprings Engineering Catalog
Request This Spring
Send your dimensions, quantity and drawing for engineering review.