Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.
When a standard spring is too large or too stiff for your build, finding a reliable miniature compression spring becomes a real challenge. Engineers, hobbyists, and repair technicians working on compact mechanisms, electronics enclosures, or precision instruments need springs that hold consistent force without taking up space. These 0.5mm wire diameter compression springs are engineered for exactly those tight-tolerance scenarios.
Each spring is formed from stainless steel wire with a diameter of 0.5mm (approximately 0.020 in). Outer diameters span from 3mm to 12mm (~0.12–0.47 in), and free lengths range from 5mm to 305mm (~0.20–12.0 in), giving you a broad selection matrix to match your exact spatial and load requirements. Sold in packs of 1, 5, 10, or 20 pieces depending on the variant selected.
Typical use cases include pen and stylus mechanisms requiring a light return force, sensor housings and probe assemblies where space is at a premium, miniature valve and latch systems in fluid or pneumatic devices, and DIY robotics or automation projects calling for repeatable spring-back action in tight channels.
| Wire Diameter | 0.5mm (~0.020 in) |
|---|---|
| Outer Diameter (OD) | 3 / 4 / 5 / 6 / 7 / 8 / 9 / 10 / 12mm — See variant options |
| Free Length | 5–305mm (~0.20–12.0 in) — See variant options |
| Pack Quantity | 1 / 5 / 10 / 20 pcs — See variant options |
| Material | Stainless Steel |
| End Type | Closed ends (typical for compression springs of this gauge) |
| Spring Rate | See variant options |
| Surface Finish | Natural stainless (no coating) |
| Corrosion Resistance | Suitable for indoor and lightly humid environments |
| Application | Precision instruments, electronics, robotics, valves, latches |
Measure the bore or guide channel your spring will sit in, then select an OD slightly smaller than that bore for a sliding fit. For free length, choose a spring that is longer than your required compressed length so it still exerts force at full compression. Use the variant selector above to browse all available OD and length combinations.
A 0.5mm wire diameter produces a relatively light spring rate, making these springs well-suited for low-force return applications such as pen mechanisms, sensor probes, and small latches. The exact rate varies with OD and free length — shorter springs with smaller ODs will be stiffer, while longer springs with larger ODs will be softer. Contact us if you need specific rate data for your variant.
Yes — stainless steel provides good resistance to oxidation and light moisture exposure. These springs are suitable for indoor environments, humid conditions, and occasional contact with water. They are not recommended for continuous immersion in saltwater or exposure to strong acids or chlorides without additional protection.
For a spring to slide freely over a shaft, the spring's inner diameter (ID = OD minus 2× wire diameter) should be slightly larger than the shaft. For a 0.5mm wire spring with OD 5mm, the ID is approximately 4mm. Match accordingly: OD 3mm → ID ~2mm, OD 6mm → ID ~5mm, OD 10mm → ID ~9mm, and so on. Always allow a small clearance for free movement.
Single-piece (1 pc) options are ideal for prototyping or replacement of a single failed spring. Multi-piece packs (5, 10, or 20 pcs) offer a lower per-unit cost and are suited for production builds, repair kits, or keeping spares on hand. Select your preferred quantity in the variant selector above.
Yes. The 0.5mm wire diameter range is commonly used in small robotic joints, gripper return mechanisms, button actuators, and sensor-reset assemblies. The stainless steel construction handles repeated cycling well in typical indoor automation environments. Choose the OD and length that fits your actuator geometry.
Longer springs with a small OD relative to their free length can buckle under compression if unsupported. For free lengths above roughly 4× the OD, we recommend using a guide rod or housing bore to keep the spring aligned during compression. This is especially important for the 120mm–305mm length options.
