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When a worn-out spring causes a mechanism to fail — whether it's a stuck valve, a sluggish latch, or a jammed industrial component — finding the right replacement fast matters. These compression springs with 2.5mm wire diameter are designed for engineers, maintenance technicians, and hands-on DIYers who need a dependable elastic return force without custom fabrication lead times.
Each spring is formed from 2.5mm wire diameter steel, with outer diameter options ranging from 15mm to 40mm (approximately 0.59" to 1.57") and free lengths from 30mm to 100mm (approximately 1.18" to 3.94"). The open-coil helical design delivers consistent compression force across the full stroke range.
Typical use cases include replacing compression springs in automotive suspension jigs, light machinery feed mechanisms, and DIY tool spring assemblies — all scenarios where a precise wire-diameter-to-OD ratio is critical for fit and function.
2.5mm Wire Diameter — Consistent wire gauge across all size variants ensures uniform spring rate and predictable load deflection curves for engineering calculations.
Wide OD Range: 15–40mm — Ten outer diameter options (15, 16, 18, 20, 22, 25, 28, 30, 35, 40mm) let you match the exact housing bore without modification.
Flexible Free Length: 30–100mm — Fifteen length options from 30mm to 100mm cover a broad stroke range, from compact mechanisms to longer travel assemblies.
Open-Coil Helical Construction — The open-coil geometry allows full compression without coil binding across the rated travel, maintaining consistent force throughout the stroke.
Elastic Return Force — Engineered for repeated compression-and-release cycles, making these springs suitable for both static preload and dynamic reciprocating applications.
Multi-Application Versatility — Compatible with automotive jigs, light industrial machinery, DIY tool assemblies, valve mechanisms, and general-purpose spring replacement projects.
| Wire Diameter | 2.5mm (0.098") |
|---|---|
| Outer Diameter Range | 15mm – 40mm (0.59" – 1.57") |
| Free Length Range | 30mm – 100mm (1.18" – 3.94") |
| Coil Type | Open-coil helical compression |
| End Type | See variant options |
| Material | See variant options |
| Surface Finish | See variant options |
| Spring Rate | See variant options |
| Max Load Capacity | See variant options |
| Operating Temperature | Contact us to confirm |
Measure the inner diameter of the housing bore or guide rod outer diameter where the spring will seat. For a housing bore, the spring OD should be slightly smaller than the bore to allow free movement. For a guide rod, the spring inner diameter (OD minus twice the wire diameter) should be slightly larger than the rod. Use the variant selector above to choose from 15mm to 40mm OD options.
Free length is the uncompressed length of the spring. Select a free length that is longer than your required compressed length by at least the travel distance you need. For example, if your mechanism needs 20mm of travel and the compressed height is 30mm, choose a free length of at least 50mm. Options range from 30mm to 100mm.
Corrosion resistance depends on the material and surface finish of the specific variant. If your application involves moisture, chemicals, or outdoor exposure, please contact us to confirm the material specification before ordering. We can advise on suitable options for your environment.
Spring rate varies by outer diameter and free length combination, as both affect the number of active coils. Please contact us with your specific OD and length selection and we will provide the calculated spring rate (N/mm or lbf/in) for that variant.
These open-coil helical compression springs are designed for repeated compression-and-release cycles in standard dynamic applications. For high-cycle fatigue applications (millions of cycles), please contact us to confirm suitability and discuss material options that may offer extended fatigue life.
Yes — the 2.5mm wire diameter and the range of outer diameters (15–40mm) are sized to fit standard spring housings and guide rods used in light machinery, automotive jigs, and DIY assemblies. Always verify the inner diameter clearance (OD minus 5mm for 2.5mm wire) against your guide rod before ordering.
In most cases, yes — provided you match the wire diameter (2.5mm), outer diameter, and free length of the original spring. If you have the original spring's part number or measurements, select the matching variant above. If you are unsure, contact us with your measurements and we will help identify the correct replacement.
