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 Hookless Extension Springs
Extension springs without conventional exposed hooks, specified around the actual end attachment and required tensile load.
- Specification
- Drawing and working requirement
- Dimensions
- Confirmed for the assembly
- Performance
- Specified at working positions
- Quotation
- Submit dimensions and quantity
About Custom Hookless Extension Springs
Hookless extension springs omit the usual projecting hook or loop. Their function therefore depends on a different attachment arrangement, such as a specified insert, fitting or assembly capture feature. The term hookless does not identify one universal end design. Provide a section or assembly view showing how pulling force enters each end, together with the installed lengths and loads.
Key Design Characteristics
- Show both attachment arrangements, including any separate fittings.
- Identify the engagement length and installation access.
- Define the installed length between functional attachment references.
Choosing Between Related Designs
A spring supplied without hooks still needs a defined tensile connection. If the attachment is specifically threaded, the reduced/threaded-end page offers a focused checklist. A plain compression coil is not a substitute merely because it has no hooks.
Specification and Inspection Review
Identify responsibility for supplying and assembling any end fittings. Put connection retention and load-test conditions on the specification rather than accepting the coil body alone.
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 |
|---|---|
| Attachment section | End geometry, insert or capture detail and engagement. |
| Body geometry | Wire diameter, body diameter and free body length. |
| Load reference | Functional attachment-to-attachment test length. |
| Tensile performance | Initial tension if required and loads at working lengths. |
| Assembly limits | Maximum extension, retention requirement and operating duty. |
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
Consider spring wire, end-fitting materials and finish together where the connection affects corrosion, wear or assembly.
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
Reduced / Threaded-End Extension Springs
Extension spring enquiries with reduced end coils or threaded attachment features, defined by the specific connection detail.
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
Swivel / Pivoting-Hook Extension Springs
Extension spring assemblies with movable attachment ends, defined by the fitting geometry, permitted rotation and working pull.
Product Questions
Hookless Extension Springs FAQ
How is a hookless spring attached?
The attachment must be shown by the project design. Specify any fitting, insert or capture feature and how it transfers the pulling force.
Is body length the load-test length?
Not necessarily. State the distance between functional attachment references at each required load.
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.