304 Stainless Steel Compression Spring Wire Dia 2.5mm, L 20-100mm, OD 12-36mm

Measure the bore or housing your spring will sit in — the spring OD should be 0.5–1.5mm smaller than the bore for free movement. For free length, choose a spring that is 10–20% longer than your required compressed length to ensure adequate preload and travel. Use the Size and Any Length dropdowns above to match your measurements.

Spring rate depends on the specific OD and free length combination selected. Larger OD and shorter free length generally produce a stiffer spring; smaller OD and longer free length produce a softer spring. If you need an exact spring rate value for engineering calculations, please contact us with your chosen variant and we can provide the specification.

304 stainless steel offers good corrosion resistance in most outdoor and mildly saline environments. It performs well in rain, humidity, and freshwater exposure. For highly aggressive saltwater or chloride-rich environments, 316 stainless steel is typically recommended. For most DIY outdoor and workshop applications, 304 is a reliable and cost-effective choice.

304 stainless steel is widely used in food-processing equipment due to its corrosion resistance and ease of cleaning. However, suitability for specific food-grade or medical applications depends on your regulatory requirements. Please verify compliance with your applicable standards before use in regulated environments.

Closed ends mean the final coil is wound tight against the adjacent coil with no gap, providing a solid bearing surface. Ground flat means that end surface is machined perpendicular to the spring axis. Together, these features ensure the spring sits squarely in its pocket, reducing lateral deflection and improving load accuracy.

Each listing is sold in packs of 5 identical springs. All 5 springs in a pack share the same OD, free length, and wire diameter as selected in the variant options above. If you need larger quantities, simply adjust the cart quantity accordingly.

Yes, provided the wire diameter (2.5mm), outer diameter, and free length match your original spring's specifications. We recommend measuring your existing spring's OD, free length, and wire diameter with calipers before selecting a replacement variant to ensure a correct fit.