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When your project demands reliable spring force in a confined space, undersized or mismatched springs cause misfires, binding, and premature failure. Engineers, hobbyists, and model makers working on electronics, miniature mechanisms, and precision instruments need a compression spring that delivers consistent load in the smallest possible footprint — and that's exactly where these 0.5mm wire diameter compression springs excel.
Each spring is formed from carbon steel wire with a wire diameter of 0.5mm (0.020 in). Outer diameters span 3mm to 10mm (approx. 0.12 in to 0.39 in), and free lengths range from 5mm to 100mm (approx. 0.20 in to 3.94 in). Springs are supplied in packs of 5 or 10 pieces depending on the selected length variant.
Typical use cases include small compression spring replacements in consumer electronics and remote controls, return springs for miniature push-button mechanisms, and load-bearing elements in scale models, robotics prototypes, and DIY precision instruments requiring small OD compression springs with consistent deflection.
Consistent 0.5mm (0.020 in) wire diameter across all variants ensures predictable spring rate and reliable deflection in tight-tolerance assemblies.
Wide OD RangeAvailable in outer diameters from 3mm to 10mm (0.12–0.39 in), covering the most common small-format compression spring sizes for electronics and hobby use.
Multiple Free LengthsFree lengths from 5mm to 100mm (0.20–3.94 in) let you match the exact travel and load requirements of your mechanism without cutting or shimming.
Carbon Steel ConstructionFormed from carbon steel wire for a balance of tensile strength and flexibility, suitable for repeated compression cycles in low-load precision applications.
Convenient Pack QuantitiesShorter lengths (5–50mm) ship in 10-piece packs; longer lengths (60–100mm) in 5-piece packs — sized for prototyping, repair, and small-batch production runs.
Closed & Ground EndsSprings feature closed ends for stable seating on flat surfaces, reducing lateral shift during compression and improving load distribution in your assembly.
| Wire Diameter | 0.5mm (0.020 in) |
|---|---|
| Outer Diameter (OD) | 3mm – 10mm (0.12 – 0.39 in) |
| Free Length | 5mm – 100mm (0.20 – 3.94 in) |
| Material | Carbon Steel |
| Finish / Coating | See variant options |
| Spring Type | Compression |
| End Type | Closed ends |
| Spring Rate | See variant options |
| Pack Quantity | 5 pcs (60–100mm) / 10 pcs (5–50mm) |
| Application | Electronics, hobby, precision DIY, models |
Measure the bore or housing your spring will sit inside, then select an OD that is 0.2–0.5mm smaller than the bore to allow free movement without binding. For a shaft-guided spring, choose an ID (inner diameter = OD minus 2× wire diameter) that clears the shaft by at least 0.2mm.
The free length should be longer than your required compressed length. A common rule of thumb is to select a free length at least 20–30% longer than the maximum compressed height in your assembly. For example, if your mechanism compresses the spring to 10mm, a free length of 13–15mm is a reasonable starting point.
With a 0.5mm wire diameter, these are light-duty compression springs suited for low-load applications such as button returns, sensor contacts, and small mechanism resets. Exact spring rates vary by OD and free length. If you need confirmed load data for a specific variant, please contact us to confirm before ordering for load-critical applications.
These springs are made from carbon steel, which offers good mechanical properties but limited corrosion resistance in humid or wet environments. For outdoor or moisture-exposed applications, consider applying a light coat of oil or grease, or contact us to inquire about stainless steel alternatives.
Yes — the closed ends provide a flat seating surface compatible with standard flat spring seats and plunger assemblies. Verify that your seat diameter matches the selected OD variant. For guided applications, confirm the inner diameter clears your guide pin or shaft.
Shorter springs (5–50mm free length) are supplied in 10-piece packs, ideal for prototyping or repair jobs where you may need spares. Longer springs (60–100mm) come in 5-piece packs. If you need larger quantities for production runs, contact us to discuss bulk pricing options.
Standard carbon steel compression springs are generally suitable for temperatures up to approximately 120°C (248°F). For applications exceeding this range, a high-temperature alloy spring would be more appropriate. Contact us to confirm suitability for your specific operating conditions.
