Compression Spring Spring Steel Pressure Coil Spring 0.5mm Wire OD 3-10mm DIY

Measure the bore or housing your spring will sit in and select an OD that fits with a small clearance — typically 0.2–0.5 mm smaller than the bore. For free length, choose a spring that is longer than your required compressed length so the spring remains under load at full travel. Use the Size selector above to browse all available OD × length combinations.

Spring rate depends on wire diameter, OD, free length, and number of active coils. Because this listing covers a wide matrix of sizes, the rate varies by variant. For light-duty DIY applications — pen mechanisms, latches, small return springs — the 0.5 mm wire gauge typically produces a soft to medium spring rate. If you need a specific rate value, please contact us with your selected size and we will provide guidance.

These springs are made from spring steel, which offers good mechanical properties but moderate corrosion resistance in dry indoor environments. For applications exposed to moisture, chemicals, or outdoor conditions, consider applying a light coat of oil or grease, or contact us to ask about alternative material options.

These springs are suitable for a wide range of light-duty applications: pen and stylus return mechanisms, small latch and lock assemblies, 3D-printed jigs and fixtures, electronic connector preloads, toy mechanisms, and general DIY repair work. They are not intended for high-load structural or safety-critical applications.

Yes. Measure the wire diameter, outer diameter, and free length of your original spring, then select the matching size from the variant options. If your original spring falls between listed sizes, choose the closest available option and test the fit and feel before committing to a larger quantity.

Both packs contain identical springs — the only difference is quantity. The 10 PCS pack is ideal for prototyping, single repairs, or trying a new size. The 100 PCS pack offers a lower per-unit cost and is suited for workshop stock, batch production, or projects requiring multiple springs of the same specification.

Use a digital caliper to measure: (1) wire diameter — the thickness of the wire itself; (2) outer diameter — the widest point across the coil; (3) free length — the total length of the uncompressed spring. Match all three dimensions to the variant options in this listing. Wire diameter for all variants here is 0.5 mm.