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When a project demands consistent return force and dimensional accuracy, finding the right compression spring can be frustrating — wrong wire gauge, wrong free length, or coils that collapse under load. These compression springs are engineered for makers, engineers, and DIY enthusiasts who need a dependable elastic element across a wide range of assemblies, from jigs and fixtures to consumer product prototypes.
Each spring is wound from 1.2mm wire diameter steel, with outer diameters ranging from 10mm to 20mm (approximately 0.39 in to 0.79 in) and free lengths from 60mm to 100mm (approximately 2.36 in to 3.94 in). The helical coil geometry provides linear spring force with controlled deflection across the full compression stroke.
Typical use cases include mechanical return mechanisms in tooling fixtures, valve and plunger assemblies requiring a compact compression spring with moderate load capacity, and prototype builds where a small compression spring with a defined free length is needed for repeatable actuation. The multi-pack options (5, 10, 20, 25, or 50 pieces) make these springs practical for both single-unit builds and small-batch production runs.
| Wire Diameter | 1.2mm (0.047 in) |
|---|---|
| Outer Diameter (OD) | 10mm – 20mm (0.39 in – 0.79 in) |
| Free Length | 60mm – 100mm (2.36 in – 3.94 in) |
| Spring Type | Helical Compression Spring |
| Coil Direction | See variant options |
| Material | See variant options |
| Surface Finish | See variant options |
| End Type | See variant options |
| Spring Rate | See variant options |
| Pack Quantity | 5 / 10 / 20 / 25 / 50 pcs (select above) |
Measure the bore or housing that will guide the spring. The spring's outer diameter should be slightly smaller than the bore to allow free movement without binding. For a shaft-guided setup, the spring's inner diameter should be slightly larger than the shaft. Select your OD from the "Diameter & Qty" option above and verify clearance before ordering.
Load capacity depends on wire diameter, OD, free length, and material. With a 1.2mm wire diameter, these springs are suited for light-to-moderate loads — typically appropriate for return mechanisms, light clamping, and plunger applications. For precise load calculations, use the spring rate formula or contact us with your deflection and load requirements.
Surface finish and material details are listed per variant — please refer to the variant options or contact us to confirm. For corrosive or high-humidity environments, we recommend verifying the finish specification before use. If you need a specific corrosion-resistant grade, reach out and we can advise on the best option.
Suitability for outdoor or wet environments depends on the surface finish of the specific variant. Uncoated steel springs may develop surface oxidation over time in humid conditions. For outdoor use, confirm the finish specification with us before purchase, or consider applying a protective coating after installation.
Free length is the spring's natural, unloaded length — the dimension listed in the variant (60mm, 70mm, 80mm, 90mm, or 100mm). Compressed length (solid height) is the length when all coils are touching under maximum load. For your design, ensure the travel distance between free length and your minimum compressed length does not exceed the spring's safe deflection range.
For single prototypes or testing, the 5-piece pack is the most economical starting point. For small-batch production or builds requiring spares, the 10 or 20-piece packs offer better per-unit value. The 25 and 50-piece packs are suited for production runs or workshop stock where consistent availability matters.
Most OD and length combinations are available across all pack sizes (5, 10, 20, 25, 50 pcs). Select your preferred wire diameter, free length, and OD/quantity combination from the three dropdowns above. If a specific combination is not shown, contact us and we can advise on availability.
