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 Side-Hook Extension Springs
Extension springs with side-positioned hooks, specified by the attachment geometry, hook orientation and pull at installed lengths.
- Specification
- Drawing and working requirement
- Dimensions
- Confirmed for the assembly
- Performance
- Specified at working positions
- Quotation
- Submit dimensions and quantity
About Custom Side-Hook Extension Springs
Side-hook extension springs place the attachment feature to the side of the coil body rather than describing only a centered end. The hook needs its own dimensions and orientation reference because it determines how the spring fits the mating pin or tab. Define pulling force at installed lengths and include the attachment points in the drawing so the load path can be reviewed.
Key Design Characteristics
- Dimension hook opening, radius and offset from the spring axis.
- Identify the relative orientation of the two ends.
- Check clearance around the hook during the complete assembly movement.
Choosing Between Related Designs
A side hook is a fixed formed attachment. A swivel connection is a separate option when the end needs rotational movement. Select by the mating interface and movement rather than treating all hook types as interchangeable.
Specification and Inspection Review
Define load-test length between agreed attachment references. Include hook opening, deformation and retention criteria in acceptance because a suitable coil body does not establish a suitable attachment.
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 |
|---|---|
| Coil body | Wire size, body diameter and body length. |
| Side-hook details | Opening, bend radius, offset and mating-pin dimensions. |
| End orientation | Angle between hooks and a clear viewing direction. |
| Pull requirements | Load at working lengths and initial tension if required. |
| Travel and duty | Maximum extension, movement frequency 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
Material and finish should be reviewed for the formed hook as well as the spring body and its 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
Swivel / Pivoting-Hook Extension Springs
Extension spring assemblies with movable attachment ends, defined by the fitting geometry, permitted rotation and working pull.
Extension Springs
Hookless Extension Springs
Extension springs without conventional exposed hooks, specified around the actual end attachment and required tensile load.
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
Side-Hook Extension Springs FAQ
Which length should be stated for load testing?
Define the distance between the specified attachment references or pin centres. State whether an overall dimension includes the hooks.
Can the end orientation be omitted?
No if orientation affects installation. Give the angle between hooks with a defined viewing direction and the relevant mating geometry.
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.