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Finding a compression spring that holds its load cycle after cycle without corroding or fatiguing is a real challenge for engineers, makers, and repair technicians alike. These stainless steel compression springs are sized for precision mechanical assemblies where consistent spring force and dimensional accuracy matter — whether you are prototyping a new mechanism or replacing a worn component in an existing machine.
Each spring is formed from stainless steel wire in diameters of 2mm, 2.5mm, 3mm, or 4mm, with outer diameters ranging from 14mm to 40mm (approximately 0.55 in to 1.57 in). The standard body length is 305mm (approximately 12 in). Exact free length, spring rate, and solid height vary by wire and outer diameter combination — see variant options for the configuration that matches your application.
These compression springs suit a wide range of use cases: valve return mechanisms in pneumatic and hydraulic systems, tension-relief assemblies in 3D printer extruder carriages, load-bearing suspension elements in small robotics platforms, and general-purpose compression spring replacement in industrial equipment maintenance. The stainless steel construction makes them a reliable choice for compression spring applications in damp or mildly corrosive environments.
| Material | Stainless Steel |
|---|---|
| Wire Diameter | 2mm / 2.5mm / 3mm / 4mm (see variant options) |
| Outer Diameter (OD) | 14mm – 40mm (see variant options) |
| Body Length | 305mm (approx. 12 in) |
| Spring Type | Compression (closed ends) |
| Free Length | See variant options |
| Spring Rate | See variant options |
| Solid Height | See variant options |
| Quantity per Pack | 1 pcs or 2 pcs (see variant options) |
| Surface Finish | Natural stainless (uncoated) |
Start with the bore or housing inner diameter your spring must fit inside — the spring outer diameter should be 0.5mm to 1.5mm smaller than the bore for clearance. Then select a wire diameter based on the load you need: heavier loads require thicker wire. If you are unsure, select your outer diameter first from the variant options and contact us with your load and travel requirements for guidance.
Spring rate (N/mm or lbf/in) describes how much force is required to compress the spring by one unit of length. The rate depends on wire diameter, outer diameter, number of active coils, and material modulus. Because these springs are 305mm long and can be cut or used at varying free lengths, the effective rate will vary. Contact us with your wire diameter, OD, and intended free length for a rate estimate.
Stainless steel offers good resistance to moisture, mild acids, and atmospheric corrosion, making these springs suitable for damp indoor environments, light outdoor exposure, and applications where occasional water contact is expected. For highly corrosive environments (salt spray, strong acids, or chlorinated water), consider additional protective measures or contact us to discuss material options.
Yes. The 305mm body length is intentionally long to allow cutting to your required free length. Use an angle grinder or spring cutter for a clean cut. After cutting, lightly grind the cut end flat if a closed-end seating surface is needed. Note that cutting changes the number of active coils and therefore the spring rate — recalculate or test the rate after cutting.
Both options contain the same spring in the same wire diameter, outer diameter, and 305mm length. The 1-piece pack is ideal for single-spring applications or prototyping. The 2-piece pack is suited for paired or mirrored spring assemblies — for example, dual-spring suspension setups or redundant return mechanisms — and typically offers a lower per-unit cost.
Measure your spring guide rod diameter (the inner guide, if used) and your housing bore diameter. The spring inner diameter (ID = OD minus 2× wire diameter) should be at least 0.5mm larger than the guide rod. The spring outer diameter should be at least 0.5mm smaller than the housing bore. Check the variant options for the OD and wire diameter combination that satisfies both clearances for your assembly.
These stainless steel compression springs are appropriate for moderate-cycle mechanical applications including valve returns, jig fixtures, and general machinery. For very high-cycle fatigue applications (millions of cycles at high stress), specify your cycle count and stress requirements when contacting us, as shot-peened or music wire springs may be more appropriate for those conditions.
