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When a project demands consistent push-back force without the worry of rust or fatigue failure, finding the right compression spring becomes the bottleneck. Whether you are a hobbyist assembling a custom mechanism, a technician maintaining precision equipment, or a maker prototyping a new device, mismatched spring dimensions waste time and compromise performance. These 304 stainless steel compression springs are engineered to deliver repeatable elastic force across a wide range of wire diameters and free lengths.
Each pack contains 5 identical springs. Wire diameter ranges from 0.5 mm to 1.5 mm (approx. 0.020 in to 0.059 in), outer diameter from 5 mm to 25 mm (approx. 0.197 in to 0.984 in), and free length from 60 mm to 100 mm (approx. 2.36 in to 3.94 in). The coil body is formed from 304-grade stainless steel wire, offering a balance of tensile strength and corrosion resistance suitable for both indoor and outdoor environments.
Typical applications include DIY mechanical assemblies requiring spring-loaded return mechanisms, small appliance repair where original springs have fatigued, electronics enclosure latches needing consistent closing force, and light industrial jigs or fixtures that rely on controlled compression travel. The broad size matrix lets engineers and makers select the exact wire-diameter-to-OD ratio needed for their load and deflection requirements.
Formed from 304-grade stainless steel wire for solid corrosion resistance in humid, wet, or mildly acidic environments where carbon steel springs would degrade.
Wire diameters from 0.5 mm to 1.5 mm paired with outer diameters from 5 mm to 25 mm and free lengths from 60 mm to 100 mm — covering a broad range of load and travel requirements in a single product line.
Close-wound coil geometry maintains uniform pitch spacing, delivering repeatable spring force and predictable deflection across the full compression stroke.
Each order ships 5 identical springs, giving you spares for prototyping, testing, or replacement without purchasing in bulk quantities you may not need.
End coils are closed to provide a flat seating surface, improving load transfer stability and reducing lateral buckling tendency during compression.
Suited for DIY mechanisms, small appliance repair, electronics enclosure latches, light industrial fixtures, and precision instrument assemblies requiring controlled spring force.
| Material | 304 Stainless Steel |
|---|---|
| Wire Diameter Range | 0.5 mm – 1.5 mm (0.020 in – 0.059 in) |
| Outer Diameter Range | 5 mm – 25 mm (0.197 in – 0.984 in) |
| Free Length Range | 60 mm – 100 mm (2.36 in – 3.94 in) |
| Spring Type | Compression |
| End Type | Closed ends |
| Coil Direction | Right-hand (standard) |
| Surface Finish | Natural stainless (no coating) |
| Quantity per Pack | 5 pieces |
| Spring Rate | See variant options |
| Max Load Capacity | See variant options |
| Operating Temperature | Typically –20°C to +200°C (–4°F to +392°F) |
Start with the bore or guide rod diameter in your assembly. The spring's outer diameter should be slightly smaller than the bore (typically 0.5–1 mm clearance) or slightly larger than the guide rod (0.3–0.5 mm clearance). Then select a wire diameter that provides the spring rate and load capacity your application requires — thicker wire produces a stiffer spring for the same OD and length.
Load capacity varies by variant. Thinner wire (0.5–0.8 mm) suits light-duty applications such as electronics latches and small mechanisms. Mid-range wire (1.0–1.2 mm) handles moderate loads in appliance repair and DIY fixtures. Heavier wire (1.4–1.5 mm) is appropriate for more demanding mechanical assemblies. Refer to the specific variant dimensions and contact us if you need calculated spring rate data.
Yes. 304 stainless steel provides solid resistance to atmospheric corrosion, moisture, and mild chemical exposure. It is suitable for outdoor DIY projects, marine-adjacent environments with limited salt spray, and applications involving occasional water contact. For highly aggressive salt-water or chemical environments, 316 stainless steel would be a stronger choice.
304 stainless steel retains its mechanical properties up to approximately 200°C (392°F) under continuous load. For intermittent exposure, slightly higher temperatures are tolerable. If your application exceeds this range, consider high-temperature alloy springs instead.
Free length is the spring's natural, unloaded length — the dimension listed in the variant name (60–100 mm). Compressed length (solid height) is the minimum length when all coils are touching. Your working travel must stay between the free length and the solid height to avoid permanent set. Ensure your assembly allows the spring to operate within this range.
Having multiple identical springs is practical for prototyping — you can test deflection and load in your assembly without waiting for a reorder if one spring is damaged during fitting. Extra pieces also serve as ready replacements when springs fatigue over time in high-cycle applications, reducing downtime.
Measure the outer diameter with calipers, the wire diameter with a micrometer or fine calipers, and the free length with a ruler while the spring is unloaded. Match these three dimensions to the variant options above. If your existing spring is slightly compressed in its resting position, add the pre-load deflection to the measured length to estimate the true free length.
