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 →Extension Springs
Custom Swivel / Pivoting-Hook Extension Springs
Extension spring assemblies with movable attachment ends, defined by the fitting geometry, permitted rotation and working pull.
- Specification
- Drawing and working requirement
- Dimensions
- Confirmed for the assembly
- Performance
- Specified at working positions
- Quotation
- Submit dimensions and quantity
About Custom Swivel / Pivoting-Hook Extension Springs
Swivel or pivoting-hook extension springs use an end connection that permits specified movement relative to the coil body. The movable fitting and its retention are part of the spring assembly. State the required rotation, mating interface and working lengths rather than assuming a conventional formed hook will provide the same freedom of movement. The coil and connection must be assessed together.
Key Design Characteristics
- Show the movable end fitting and how it is retained.
- Define permitted rotation and any stop or movement restriction.
- Identify connection clearance under both installation and working loads.
Choosing Between Related Designs
A fixed side hook changes attachment position; it does not provide a defined swivel joint. Choose a movable end only when the assembly needs that movement and can accommodate the fitting and its retention features.
Specification and Inspection Review
Specify whether acceptance includes pivot movement, fitting retention and connection wear. Define the load-test attachment and length references to make the coil and assembly measurements consistent.
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 |
|---|---|
| End fitting | Hook or eye geometry, pivot detail and mating-pin size. |
| Movement | Required rotational range, alignment and stops. |
| Coil body | Wire size, body diameter, free length and initial tension. |
| Working pull | Loads at installed lengths and maximum extension. |
| Retention and duty | Connection retention requirement, cycling and environment. |
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 materials and surface treatment for both the spring wire and the movable fitting, including their contact environment.
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.
Extension Springs
Side-Hook Extension Springs
Extension springs with side-positioned hooks, specified by the attachment geometry, hook orientation and pull at installed lengths.
Extension Springs
Reduced / Threaded-End Extension Springs
Extension spring enquiries with reduced end coils or threaded attachment features, defined by the specific connection detail.
Extension Springs
Continuous-Length Extension Springs
Custom Continuous-Length Extension Springs manufactured to your drawing, dimensions, load or torque, material, working environment and production requirements.
Product Questions
Swivel / Pivoting-Hook Extension Springs FAQ
Does swivel mean unrestricted rotation?
No. Define the movement that the connection must permit and any limits imposed by the fitting, retention feature or mating part.
Can a standard hook be substituted?
Only after checking the movement and attachment requirements. A fixed hook does not provide the same defined joint motion.
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.