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 →Compression Springs
Custom Variable-Pitch / Progressive Compression Springs
Variable-pitch compression springs specified by a required load curve, with coil spacing and working travel reviewed together.
- Specification
- Drawing and working requirement
- Dimensions
- Confirmed for the assembly
- Performance
- Specified at working positions
- Quotation
- Submit dimensions and quantity
About Custom Variable-Pitch / Progressive Compression Springs
Variable-pitch springs use different spacing along the coil body. As compression progresses, some coils can come into contact and stop contributing to active movement, changing the effective spring rate. A useful specification therefore describes several force-height points, including any desired transition. Variable pitch is a design feature; a progressive performance claim still requires the intended geometry and load curve to be checked.
Key Design Characteristics
- Mark the start and end of each pitch region.
- Identify working positions on both sides of the desired rate transition.
- State the maximum travel and whether any coil contact is intentional.
Choosing Between Related Designs
A constant-pitch spring is commonly specified with a working rate over its active range. Use the variable-pitch page when the assembly needs a deliberate change in resistance through its travel; compare complete force curves rather than one rate number.
Specification and Inspection Review
Agree load-test positions and tolerances for the different parts of the stroke. Record any allowed hysteresis or permanent set separately so the acceptance test reflects the intended progressive action.
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 |
|---|---|
| Pitch regions | Coil spacing, coil count and position of each region. |
| Force curve | Required forces at multiple heights, including transition points. |
| Compression limit | Minimum working height and permitted coil-contact condition. |
| Envelope | Body diameter, guide clearance and seating geometry. |
| Duty cycle | Operating temperature, cycle range and allowable load change. |
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 selection should consider the highest working stress and repeated movement across pitch transitions.
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.
Compression Springs
Cylindrical Compression Springs
A straight, constant-diameter coil for predictable axial force where the spring works inside a bore, around a guide, or between two flat seats.
Compression Springs
Hourglass / Concave Compression Springs
Compression springs with a narrower waist and wider end coils, specified by the full diameter profile, working heights and required axial loads.
Compression Springs
Convex Compression Springs
Barrel-shaped compression springs with a wider middle and smaller end coils, reviewed against seat dimensions, housing clearance and working loads.
Product Questions
Variable-Pitch / Progressive Compression Springs FAQ
Is one spring-rate value enough?
Usually not for a deliberately progressive design. Give the load required at several working heights and identify where the response should change.
Does different coil spacing guarantee the desired progression?
No. Coil-contact sequence and active geometry determine the response. The proposed spring must be checked against the specified force-height points.
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.