Compression Springs Wire Dia 0.5mm OD 3mm 304 Stainless Steel Vibration Damping

Measure the distance between the two bearing surfaces when the spring is at its intended compressed length, then add the required travel (stroke) to get the minimum free length. For vibration-isolation applications, also account for preload — the spring should be slightly compressed at rest to maintain contact under dynamic loads. Select the next available length option above your calculated value.

Spring rate depends on wire diameter, outer diameter, number of active coils, and material modulus. Because the number of active coils varies with free length, each length variant has a different spring rate. Exact rate values are not listed here — if you need a specific rate, please contact us with your free length and deflection requirements and we can confirm suitability.

304 stainless steel provides good resistance to atmospheric corrosion, fresh water, and mild chemical exposure. It is suitable for most outdoor and humid indoor applications. For marine environments, salt spray, or exposure to chlorides, 316 stainless steel is recommended. These springs are not coated or plated, so the corrosion resistance comes entirely from the alloy composition.

The bore inner diameter should be at least 3.1–3.2mm to allow the spring to compress freely without binding against the bore wall. If the spring will be guided on a pin rather than inside a bore, the pin outer diameter should be no larger than approximately 2mm (the approximate inner diameter of the spring) to avoid coil-to-pin contact during compression.

304 stainless steel retains adequate mechanical properties up to approximately 300 °C (572 °F) for short-term exposure. Prolonged operation above 250 °C may cause stress relaxation (set), reducing the effective spring force over time. For high-temperature applications above this range, consider high-temperature alloys such as Inconel or 17-7 PH stainless steel.

For prototyping or repair of a single unit, the 10-piece quantity is usually sufficient and minimizes upfront cost. For small-batch production runs of 10–50 units, the 50- or 100-piece options offer a lower per-unit cost and reduce the risk of running short mid-production. The per-piece price decreases significantly at higher quantities, so it is worth calculating total project demand before ordering.

Yes. The 0.5mm wire / 3mm OD specification is commonly used in retractable pen mechanisms, stylus return springs, and small push-button assemblies. The shorter lengths (5–30mm) are most applicable for these uses. Verify the required spring force against the click mechanism's actuation force to ensure a satisfying, consistent feel.