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When a project demands a compact, corrosion-resistant spring that holds its shape under repeated load cycles, finding the right wire diameter and free length in one place can be a real challenge. Whether you are a hobbyist assembling a precision mechanism, a maker prototyping a new device, or a technician replacing worn-out springs in small equipment, these 304 stainless steel compression springs give you the exact geometry you need without over-engineering the solution.
Each spring is wound from 304 stainless steel wire in either 0.5 mm (≈0.020 in) or 0.6 mm (≈0.024 in) diameter. Outer diameters span 3 mm to 12 mm (≈0.12 in to 0.47 in), and free lengths range from 5 mm to 305 mm (≈0.20 in to 12.0 in), giving you a broad selection to match your exact application. Sold in packs of 10 pieces.
Typical use cases include small compression spring for electronics enclosures, miniature stainless steel compression spring for pen mechanisms and clicker buttons, and precision coil spring replacement for hobby RC vehicles, camera sliders, and medical-device prototypes where corrosion resistance and dimensional consistency are non-negotiable.
Wound from grade 304 stainless steel, these springs resist rust, oxidation, and mild chemical exposure — ideal for humid or outdoor environments.
Choose 0.5 mm or 0.6 mm wire diameter to match your required spring rate and load capacity without over-sizing the assembly.
Outer diameters from 3 mm to 12 mm and free lengths from 5 mm to 305 mm cover the majority of small-spring applications in one product listing.
Uniform coil spacing ensures even load distribution along the spring body, reducing the risk of buckling or uneven compression under repeated cycling.
Each order ships as a pack of 10 identical springs, giving you spares for prototyping, testing, or batch assembly without ordering in bulk.
Closed and ground ends (typical for this spring class) provide flat seating surfaces, making these springs drop-in compatible with standard spring pockets and guide pins.
| Material | 304 Stainless Steel |
|---|---|
| Wire Diameter | 0.5 mm (≈0.020 in) or 0.6 mm (≈0.024 in) |
| Outer Diameter (OD) | 3 mm – 12 mm (≈0.12 in – 0.47 in) |
| Free Length | 5 mm – 305 mm (≈0.20 in – 12.0 in) |
| Spring Type | Compression (coil) |
| End Type | See variant options |
| Spring Rate | See variant options |
| Surface Finish | Natural stainless (no coating) |
| Quantity per Pack | 10 Pcs |
| Weight (per pack) | See variant options |
Start with three key dimensions: outer diameter (OD), wire diameter, and free length. The OD must fit inside your spring pocket or around your guide pin with a small clearance (typically 0.5–1 mm). The wire diameter determines the spring rate — a thicker wire (0.6 mm) produces a stiffer spring than a thinner wire (0.5 mm) at the same OD and length. The free length should be longer than your required compressed length to ensure the spring still exerts force at full compression. Select your size from the variant dropdown above.
Because load capacity varies significantly across the wide size range offered (OD 3–12 mm, length 5–305 mm, wire 0.5–0.6 mm), exact load values differ per variant. As a general guide, 0.5 mm wire springs in the smaller OD range are suited for light-duty applications (grams to low single-digit Newtons), while 0.6 mm wire in larger ODs can handle moderate loads. If you need precise spring-rate data for a specific variant, please contact us to confirm.
Yes. 304 stainless steel provides good resistance to rust, oxidation, and mild acids or alkalis. It performs well in humid environments, light outdoor exposure, and many indoor industrial settings. For highly aggressive chemical environments (e.g., chloride-rich or strongly acidic conditions), consider 316 stainless steel instead.
Wire diameter directly affects spring stiffness (spring rate). A 0.6 mm wire spring is stiffer and can carry more load than a 0.5 mm wire spring of the same OD and free length. If your application requires a softer, more compliant spring (e.g., a light return mechanism), choose 0.5 mm. If you need more resistance or a firmer push-back force, choose 0.6 mm.
Yes, for most standard applications. The OD range (3–12 mm) covers common guide-pin and pocket sizes used in hobby, electronics, and light mechanical assemblies. Ensure your guide pin diameter is at least 0.5–1 mm smaller than the spring's inner diameter (ID = OD minus 2× wire diameter) to allow free movement without binding.
304 stainless steel offers solid corrosion resistance for most outdoor and wet-environment applications, including garden equipment, marine hobby projects, and outdoor enclosures. However, prolonged exposure to saltwater or chlorinated water may eventually cause surface staining. For marine-grade requirements, 316 stainless steel is recommended.
Buying in a 10-piece pack gives you spares for prototyping iterations, replacements if one spring is damaged during installation, and extras for batch builds. For small-scale makers and repair technicians, having a few identical springs on hand avoids project delays caused by re-ordering a single piece.
