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When a spring fails mid-project, the whole assembly stops. Whether you are a hobbyist building a custom mechanism, a maker prototyping a device, or a technician replacing worn-out components, finding the exact wire diameter and free length you need without ordering a custom batch is a real challenge. These 304 stainless steel compression springs are stocked in a wide range of sizes so you can match your spec without compromise.
Each spring is wound from 304-grade stainless steel wire with a diameter of either 0.5 mm (~0.020 in) or 0.6 mm (~0.024 in). Outer diameters range from 3 mm to 12 mm (~0.12–0.47 in) and free lengths span from 5 mm to 305 mm (~0.20–12.0 in), covering a broad spectrum of compact and medium-length applications. Springs are available in packs of 1, 5, or 10 pieces depending on the size selected.
Typical use cases include electronic enclosure latches, pen and stylus mechanisms, valve return assemblies, jig and fixture clamping systems, and small-scale robotics or automation builds where a reliable, corrosion-resistant compression spring is required in a tight space.
Wound from 304-grade stainless steel wire for solid corrosion resistance in humid, mildly acidic, or outdoor environments where carbon steel springs would rust prematurely.
Wire diameters of 0.5 mm and 0.6 mm combined with outer diameters from 3–12 mm and free lengths from 5–305 mm give you a large selection to match your exact dimensional requirement.
Each spring is manufactured with uniform coil pitch to deliver repeatable spring force and predictable deflection across the full compression stroke.
Available in packs of 1, 5, or 10 pieces so you can order exactly what your project needs — whether a single replacement or a small batch for prototyping.
The 0.5 mm and 0.6 mm wire diameters are well-suited for miniature mechanisms, pen assemblies, small valves, and precision instruments where larger wire gauges would not fit.
Suitable for electronics, robotics, jigs, fixtures, medical devices, and general DIY mechanical assemblies requiring a reliable small-diameter compression spring.
| Material | 304 Stainless Steel |
|---|---|
| Wire Diameter | 0.5 mm / 0.6 mm (approx. 0.020 in / 0.024 in) |
| Outer Diameter (OD) | 3 mm – 12 mm (approx. 0.12 in – 0.47 in) |
| Free Length | 5 mm – 305 mm (approx. 0.20 in – 12.0 in) |
| Spring Type | Compression (open-end coil) |
| End Type | See variant options |
| Spring Rate | See variant options |
| Surface Finish | Natural stainless (no coating) |
| Pack Quantity | 1 pcs / 5 pcs / 10 pcs (varies by size) |
Start with three key dimensions: outer diameter (OD), wire diameter, and free length. The OD must fit inside your housing bore with a small clearance (typically 0.5–1 mm). The wire diameter determines the spring rate and load capacity — thicker wire means a stiffer spring. The free length should be longer than your required compressed length to ensure the spring still exerts force at full compression. Use the variant selector above to match these dimensions to your application.
These springs use 0.5 mm and 0.6 mm wire diameters, which are designed for light-duty to medium-duty applications such as pen mechanisms, small valves, electronic latches, and precision instruments. They are not intended for heavy industrial loads. If you need a higher spring rate, consider a larger wire diameter or a shorter free length variant.
304 stainless steel offers solid corrosion resistance in most everyday environments including humid conditions, mild chemical exposure, and outdoor use. It is not fully resistant to chloride-rich environments such as saltwater immersion. For marine or highly corrosive applications, 316 stainless steel would be a better choice.
The 0.6 mm wire diameter produces a stiffer spring with a higher spring rate compared to the 0.5 mm wire at the same OD and free length. If your application requires more force or resistance to compression, choose 0.6 mm. If you need a softer, more compliant spring, choose 0.5 mm. Both are available across a wide range of OD and length combinations.
Yes, provided the OD of the spring matches your housing bore with appropriate clearance, and the inner diameter (ID) is large enough to slide over any guide pin or plunger. The ID is approximately equal to OD minus twice the wire diameter. For example, a 0.5x5mm spring has an ID of approximately 4 mm. Always verify your housing dimensions before ordering.
Absolutely. The small wire diameters and wide range of OD and length options make these springs well-suited for robotics actuators, button return mechanisms, sensor mounts, and PCB-level spring contacts. The 304 stainless material also avoids the magnetic interference that carbon steel springs can introduce near sensitive electronics.
The size format is Wire Diameter × Outer Diameter × Free Length, all in millimeters. For example, "0.5x5x30mm" means wire diameter 0.5 mm, outer diameter 5 mm, and free length 30 mm. Select the combination that matches your dimensional requirements from the dropdown above.
