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When your project demands a reliable return force in a compact footprint, finding the right small compression spring can be frustrating. Undersized springs that lose tension, oversized ones that won't fit the bore — these are real pain points for electronics engineers, instrument technicians, and hands-on DIYers who need exact dimensions. These small compression springs are engineered to deliver consistent elastic force in confined assemblies where every millimeter counts.
Each spring is cold-wound from carbon steel wire with a diameter of 0.8mm or 0.9mm. The outer diameter (OD) ranges from 5mm to 14mm (~0.20–0.55 in), and the free length spans 10mm to 100mm (~0.39–3.94 in). Springs are available in packs of 5, 10, or 30 pieces to suit both prototyping and production needs.
Typical use cases include push-button mechanisms and tactile switches, pen and stylus retraction assemblies, precision instrument latches and valve returns, and small-bore jig fixtures in CNC and automation setups. The wide size matrix lets you match wire stiffness and travel to your exact load requirement without custom tooling.
| Spring Type | Compression Spring |
|---|---|
| Wire Diameter | 0.8mm / 0.9mm (~0.031 / 0.035 in) |
| Outer Diameter (OD) | 5–14mm (~0.20–0.55 in) |
| Free Length | 10–100mm (~0.39–3.94 in) |
| Material | Carbon Steel |
| Winding Direction | See variant options |
| End Type | See variant options |
| Surface Finish | See variant options |
| Spring Rate | See variant options |
| Pack Quantity | 5 / 10 / 30 pcs (select above) |
Start with three measurements: the bore (inner diameter of the housing — your spring OD should be slightly smaller), the free length (the uncompressed height your assembly can accommodate), and the required load at a given deflection. Match the wire diameter to the stiffness you need — 0.9mm wire is stiffer than 0.8mm at the same OD and length. Use the variant selector above to filter by Size (Wire Dia. × OD × Length) and Pack Quantity.
Spring rate depends on the specific wire diameter, outer diameter, free length, and number of active coils — all of which vary across the 100+ variants in this listing. If you need a precise spring rate value for engineering calculations, please contact us with your selected variant dimensions and we can provide further guidance.
These springs are made from carbon steel, which offers good mechanical properties but limited corrosion resistance in humid or wet environments. For indoor, dry, or low-humidity applications they perform reliably. If your application involves moisture, chemicals, or outdoor exposure, consider using stainless steel springs instead. Contact us to confirm material suitability for your environment.
These springs are widely used in push-button and tactile switch mechanisms, pen and stylus retraction assemblies, precision instrument latches, valve return mechanisms, small-bore jig fixtures, and general DIY repair projects. The OD range of 5–14mm and length range of 10–100mm make them suitable for electronics, instrumentation, and light mechanical assemblies.
Yes — the consistent coil geometry and carbon steel construction make these springs suitable for light-duty CNC fixtures, sensor return mechanisms, and automation components where small-bore springs are required. Verify the required spring rate and maximum deflection against your load specifications before installation.
Ordering a 30-pack is cost-effective for small-batch production runs, prototyping iterations where you may test multiple deflection points, or keeping spares on hand for maintenance. The per-unit cost is lower in larger packs. If you only need a few for a one-off repair or prototype, the 5-pack or 10-pack options keep your order lean.
Wire diameter directly affects spring stiffness (spring rate). A 0.9mm wire spring will be stiffer — requiring more force to compress the same distance — compared to a 0.8mm wire spring of the same OD and length. Choose 0.8mm for lighter loads and more travel, and 0.9mm when you need a firmer return force in the same footprint.
