200mm Length Stainless Steel Compression Spring 2 - 4mm Pressure/ Coil Springs

Start with the bore or seat diameter in your assembly. The outer diameter of the spring should be slightly smaller than the bore (typically 0.5–1mm clearance) so it seats without binding. Then select a wire diameter that delivers the spring rate your load requires — thicker wire (e.g., 3.5–4mm) produces a stiffer spring, while thinner wire (e.g., 2–2.5mm) gives a softer, more compliant response. If you are unsure, contact us to confirm before ordering.

Spring rate depends on wire diameter, outer diameter, number of active coils, and material modulus. Because these springs span a wide size range, the spring rate varies by variant. As a general guide, larger wire diameters and smaller outer diameters produce higher spring rates. For precise load calculations, use the spring rate formula or contact us with your specific size selection and we can provide guidance.

Yes. Stainless steel offers good resistance to atmospheric corrosion, moisture, and mild chemical exposure, making these springs suitable for outdoor enclosures, humid workshop environments, and light-duty marine-adjacent applications. For highly aggressive chemical environments (strong acids, chloride-heavy saltwater immersion), verify the specific stainless alloy grade is appropriate for your conditions.

These springs are designed with standard coil geometry and are compatible with flat spring plates, bored housings, and common linear motion spring seats used in DIY automation and maker projects. Always verify the outer diameter fits your bore and the inner diameter clears your guide rod before assembly. The inner diameter is approximately the outer diameter minus twice the wire diameter.

These are compression springs designed to resist compressive loads along their axis. They work well in both free-compression applications (where the spring is compressed from its free length) and pre-loaded assemblies (where the spring is installed under an initial compression). Avoid using them in tension or torsion applications, as they are not designed for those load directions.

If you are prototyping or need a single spring for a one-sided mechanism, the 1-piece option is the most economical choice. If your assembly requires a matched pair — for example, symmetric spring returns on either side of a sliding carriage or a dual-spring clamp — select the 2-piece variant to ensure both springs come from the same production batch and have consistent characteristics.

The inner diameter is approximately equal to the outer diameter minus twice the wire diameter. For example, a 2mm wire / 20mm outer diameter spring has an approximate inner diameter of 16mm. Allow at least 0.5–1mm clearance between the guide rod and the spring's inner diameter to prevent binding during compression. If you need a precise inner diameter for a specific variant, contact us to confirm.