Wire Diameter 0.5mm-0.6mm OD 3mm-10mm Small Spring Compression Pressure Spring

Start with three measurements from your assembly: the bore diameter (to determine the maximum OD), the shaft or guide diameter (to determine the minimum ID — typically OD minus twice the wire diameter), and the available travel (to determine the required free length and solid height). Select a wire diameter that gives you the spring rate and load capacity your application needs. If you are unsure, order a small pack of two or three candidate sizes to test fit before committing to a larger quantity.

A thicker wire diameter (0.6 mm) produces a stiffer spring with a higher spring rate and greater load capacity for the same OD and free length. The 0.5 mm wire springs are softer and deflect more easily under the same load, making them suitable for lighter-duty applications such as pen mechanisms or delicate contact assemblies. Choose 0.6 mm wire when you need more force; choose 0.5 mm wire when you need a gentler, more compliant return.

These springs are surface-treated to resist light oxidation in typical indoor environments such as electronics enclosures and instrument housings. For prolonged exposure to moisture, salt spray, or outdoor conditions, we recommend evaluating a stainless steel alternative or applying an additional protective coating. Contact us to confirm suitability for your specific environment before ordering.

Yes. Small compression springs are widely used in battery contacts and spring-loaded electrical connectors because they maintain consistent contact pressure even under vibration. Ensure the spring OD and free length match your contact housing dimensions, and verify that the surface finish is compatible with your conductivity requirements. For critical electrical applications, test a sample before full deployment.

The three numbers represent: wire diameter × outer diameter × free length, all in millimetres. For example, 0.5 × 3 × 10 mm means a spring wound from 0.5 mm wire, with an outer diameter of 3 mm, and a free (uncompressed) length of 10 mm. Use these three dimensions to match the spring to your bore, guide, and travel requirements.

For prototyping or single-unit repairs, the 5-piece pack is usually sufficient and lets you test fit without excess stock. For small production runs, maintenance kits, or if you anticipate needing replacements, the 10-piece pack offers better value per spring. Both pack sizes are available for every size combination — simply select your preferred quantity in the QTY(PCS) option above.

These springs are designed to work with standard cylindrical bores and guide rods. The OD range of 3–12 mm covers a wide variety of miniature mechanism housings. To avoid binding, the bore should be at least 0.1–0.2 mm larger than the spring OD, and any guide rod should be at least 0.1–0.2 mm smaller than the spring ID. Always verify clearances with a sample spring before finalising your design.