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When a repair stalls because you can't find a spring that fits, the frustration is real — especially for makers, repair technicians, and mechanical hobbyists who need exact dimensions. These small compression springs are engineered for applications where space is tight and dimensional accuracy matters. Whether you're restoring a mechanism, prototyping a device, or stocking a workshop, having the right spring on hand makes all the difference.
Each spring is formed from steel wire with a diameter ranging from 0.6 mm to 1 mm (approximately 0.024"–0.039"). Outer diameters span 5 mm to 20 mm (approx. 0.197"–0.787"), and free lengths run from 10 mm to 100 mm (approx. 0.394"–3.937"). Springs are wound in a closed-end coil configuration typical of compression-type springs and are available in packs of 5 or 10 pieces.
Typical use cases include small compression springs for electronics enclosures, miniature compression springs for pen mechanisms and clicker assemblies, and precision coil springs for model engineering, robotics actuators, and DIY mechanical projects requiring consistent return force across a compact travel range.
| Spring Type | Compression (closed-end coil) |
|---|---|
| Wire Diameter Range | 0.6 mm – 1.0 mm (0.024" – 0.039") |
| Outer Diameter Range | 5 mm – 20 mm (0.197" – 0.787") |
| Free Length Range | 10 mm – 100 mm (0.394" – 3.937") |
| Material | Steel wire |
| End Type | Closed ends |
| Surface Finish | See variant options |
| Spring Rate | See variant options |
| Load Capacity | See variant options |
| Pack Quantity | 5 pcs or 10 pcs (select above) |
| Exact Size (Wire Dia. × OD × Length) | See variant options |
Match the outer diameter (OD) to the bore or housing it sits in, leaving a small clearance (typically 0.2–0.5 mm). The wire diameter determines stiffness — thicker wire produces a stiffer spring. Select the free length slightly longer than your required compressed travel plus the solid height. Use the variant selector above to pick Wire Dia. × OD × Length.
These compression springs are wound from steel wire. Steel provides a good balance of tensile strength and elastic recovery for general mechanical and hobby applications. If your application requires corrosion resistance in wet or chemical environments, consider whether a coated or stainless variant is needed for your specific conditions.
Standard steel springs offer moderate corrosion resistance suitable for indoor, dry, or lightly humid environments. For outdoor, marine, or chemically aggressive environments, additional protection such as a protective coating or use of stainless steel springs is advisable. Contact us to confirm surface treatment details for specific variants.
These springs are well-suited for electronics enclosures, pen and clicker mechanisms, model engineering, hobby robotics, 3D printer components, small appliance repairs, and general DIY mechanical assemblies. Always verify that the inner diameter of the spring clears any guide rod, and that the OD fits within the housing bore before ordering.
Spring rate (k) is determined by wire diameter, coil diameter, number of active coils, and material shear modulus. Because the number of active coils varies by length variant, exact spring rate values differ per SKU. If you need a specific spring rate for your design, please contact us with your Wire Dia., OD, and Length selection and we can provide further guidance.
Each listing variant is sold as a single size in packs of 5 or 10 pieces. To build a mixed assortment, add multiple variants to your cart individually. This lets you stock exactly the sizes your workshop or project requires without paying for sizes you won't use.
Both pack options contain the same spring in the same size. The 5-piece pack is ideal for one-off repairs or initial prototyping, while the 10-piece pack offers better per-unit value for batch builds, production runs, or workshop stock. Select your preferred quantity using the Pack quantity option above.
