Compression Spring Spring Steel Pressure Coil Spring 1mm Wire OD 5-20mm DIY

Measure the bore or spring seat diameter in your assembly — the spring OD should be slightly smaller than the bore for a sliding fit, or slightly larger if it needs to sit over a post. For free length, choose a spring that is longer than your required compressed length to ensure adequate preload and travel. When in doubt, order one piece first to verify fit before purchasing a 5-pack.

Spring rate varies by OD and free length combination. Longer springs with larger ODs generally have lower spring rates (softer), while shorter springs with smaller ODs tend to be stiffer. Exact spring rate values are not listed per variant — if your application requires a specific rate, contact us to confirm before ordering.

These springs are made from spring steel, which offers moderate corrosion resistance suitable for indoor and dry environments. For applications exposed to moisture, chemicals, or outdoor conditions, consider applying a light coat of oil or grease, or contact us about alternative material options such as stainless steel springs.

Both options are the same spring — the only difference is quantity. The 1 PCS option is ideal for single repairs or fit verification. The 5 PCS pack offers a per-unit discount and is suited for prototyping, batch builds, or keeping spares on hand. Select your preferred quantity using the "Quantitys" option above.

Standard spring steel has a typical service temperature range of up to approximately 120°C (248°F). For applications exceeding this range, the spring may experience reduced elastic memory and permanent set over time. If your use case involves elevated temperatures, contact us to confirm suitability or discuss alternative materials.

Yes — the closed-end coil design provides flat seating surfaces compatible with most standard spring pockets, plunger bores, and latch housings. Verify that the OD matches your bore clearance and that the free length provides sufficient travel for your mechanism before finalizing your selection.

If you require a wire diameter, OD, or free length outside the listed range, please contact us with your specifications. We carry a wide range of spring sizes and may be able to source or recommend a suitable alternative for your project.