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When your project demands reliable spring force in a compact footprint, finding the right compression spring can be frustrating — wrong wire diameter, wrong free length, or springs that corrode after a few weeks. These stainless steel compression springs with a 0.5mm wire diameter are engineered for hobbyists, model makers, electronics repair technicians, and precision DIY builders who need consistent performance in tight spaces.
Each spring is formed from stainless steel wire with a diameter of 0.5mm (approx. 0.020 in). Outer diameters range from 3mm to 12mm (approx. 0.12–0.47 in), and free lengths span 5mm to 50mm (approx. 0.20–1.97 in). Available in packs of 5, 10, or 50 pieces depending on the variant selected.
Typical use cases include small compression spring for electronics enclosures and battery contacts, miniature spring for scale models and RC mechanisms, and replacement compression spring for precision instruments and pen mechanisms. The wide size matrix makes these springs suitable for prototyping, repair, and light industrial assembly tasks.
| Wire Diameter | 0.5mm (approx. 0.020 in) |
|---|---|
| Outer Diameter (OD) | 3mm – 12mm (approx. 0.12–0.47 in) — See variant options |
| Free Length | 5mm – 50mm (approx. 0.20–1.97 in) — See variant options |
| Material | Stainless Steel |
| Spring Type | Compression Spring (open ends, not ground) |
| Coil Direction | Right-hand wound (standard) |
| Surface Finish | Natural stainless (no coating) |
| Pack Quantity | 5 pcs / 10 pcs / 50 pcs — See variant options |
| Weight (per pack) | See variant options |
| Spring Rate | See variant options |
Measure the bore or housing your spring will sit in — the spring's outer diameter should be slightly smaller than the bore to allow free movement. For free length, measure the uncompressed gap your spring needs to fill, then add the desired travel distance. For example, if your housing is 5mm wide and you need 8mm of travel, choose an OD of 4–4.5mm and a free length of 10–15mm.
Yes. With a 0.5mm wire diameter, these springs are designed for light-duty applications such as battery contacts, pen and stylus mechanisms, small switches, and model assemblies. They are not intended for heavy industrial loads. If you need higher spring rates, consider a larger wire diameter.
These springs are made from stainless steel, which offers good corrosion resistance in normal indoor and mildly humid environments. They are not recommended for prolonged submersion in water or exposure to strong acids and chlorides. For marine or highly corrosive environments, additional protective measures may be needed.
The springs themselves are identical — only the quantity differs. The 10-piece pack is suitable for single-project repairs or prototyping, while the 50-piece pack offers better value per unit for production runs, bulk repairs, or stocking a workshop. Select your preferred quantity in the "Length & Qty (pcs)" option above.
Yes. The small outer diameters (3mm–12mm) and short free lengths (5mm–50mm) make these springs well-suited for RC suspension components, scale model mechanisms, and miniature assemblies. Match the OD to your model's spring seat diameter and the free length to your required suspension travel.
Spring rate depends on wire diameter, outer diameter, free length, and number of active coils. Because this product covers a wide size matrix, specific spring rate values vary by variant. If you need a confirmed spring rate for an engineering application, please contact us with your required OD, free length, and load specifications before ordering.
These are open-end, non-ground compression springs, which is standard for small-diameter springs in this size range. Open ends are suitable for most light-duty applications. If your application requires closed and ground ends for flat seating, please contact us to confirm availability.
