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When a repair stalls because you can't find a spring small enough to fit, it's frustrating — especially for electronics hobbyists, model builders, and precision instrument technicians who need exact dimensions. These small pressure compression springs are engineered for applications where standard hardware-store springs are simply too large or too stiff.
Each pack contains 10 pieces of stainless steel compression springs. Wire diameters range from 0.2 mm to 0.5 mm (approximately 0.008 in to 0.020 in), outer diameters from 1.0 mm to 10 mm (approximately 0.039 in to 0.394 in), and free lengths from 5 mm to 25 mm (approximately 0.197 in to 0.984 in). Select your exact wire diameter, outer diameter, and length combination from the variant options above.
Typical use cases include small compression spring replacement in mechanical pencils and retractable pens, precision spring for RC model suspension and servo mechanisms, and miniature compression spring for electronic switch assemblies and PCB-mounted contacts.
| Material | Stainless Steel |
|---|---|
| Wire Diameter Range | 0.2 mm – 0.5 mm (0.008 in – 0.020 in) |
| Outer Diameter Range | 1.0 mm – 10 mm (0.039 in – 0.394 in) |
| Free Length Range | 5 mm – 25 mm (0.197 in – 0.984 in) |
| Spring Type | Compression (open-coil) |
| End Type | See variant options |
| Surface Finish | See variant options |
| Spring Rate | See variant options |
| Quantity per Pack | 10 pieces |
| Coil Direction | See variant options |
Wire diameter determines the stiffness (spring rate) of the spring — thicker wire produces a stiffer spring. For very light-load applications such as pen clickers or small switches, 0.2 mm or 0.3 mm wire is typically appropriate. For slightly higher loads in model mechanisms or small latches, 0.4 mm or 0.5 mm wire is more suitable. If you have the original spring, measure its wire with a micrometer or caliper before ordering.
Wire diameter is the thickness of the steel wire used to wind the coil. Outer diameter is the overall width of the spring from one outer edge to the other. When fitting a spring into a bore or housing, the outer diameter must be smaller than the bore. When fitting a spring over a pin or shaft, the inner diameter (outer diameter minus twice the wire diameter) must be larger than the pin.
Yes. These springs are made from stainless steel wire, which provides good resistance to oxidation and mild corrosion in typical indoor environments. For prolonged exposure to moisture, salt spray, or aggressive chemicals, verify the specific alloy grade meets your requirements by contacting us to confirm.
Stainless steel offers better corrosion resistance than carbon steel springs, making these suitable for moderately humid conditions. For harsh outdoor or marine environments, confirm the alloy specification is adequate for your use case before ordering.
Free length is the uncompressed length of the spring. Your application's travel distance plus the compressed (solid) height determines the minimum free length you need. As a conservative rule, select a free length at least 20–30% longer than your required compressed height to avoid coil bind. Measure the cavity depth or stroke length in your mechanism before selecting a variant.
The smallest variants (0.2 mm wire, 1.0–2.0 mm outer diameter) are dimensionally compatible with many watchmaking and fine instrument applications. However, spring rate and end-type specifications should be verified against your instrument's requirements. Contact us to confirm if you need specific load or tolerance data.
Larger outer diameters and longer free lengths require more material per spring, which is reflected in a slightly higher price for those specific size combinations. The majority of variants are priced at the standard rate; only the largest or longest combinations carry a small premium.
