Compression Spring Spring Steel Pressure Coil 2mm Wire OD 8-25mm 10-100mm Shop

Measure the bore or housing inner diameter your spring will sit inside, then select an OD that provides a small clearance — typically 0.5–1.5 mm smaller than the bore. If the spring rides on a guide rod, the rod outer diameter should be at least 1 mm smaller than the spring inner diameter (ID = OD minus twice the wire diameter, so ID ≈ OD − 4 mm for this 2 mm wire series).

Start with your required compressed length plus your desired travel (stroke). Add a safety margin of 10–15% to avoid coil bind. For example, if you need 20 mm of travel and a compressed length of 30 mm, look for a free length of approximately 55–58 mm. Choose the closest available size in the variant list.

Spring steel has moderate corrosion resistance. For outdoor, wet, or chemically exposed environments, consider applying a protective coating or lubricant after installation. If long-term corrosion resistance is critical, contact us to confirm finish options or consider stainless steel alternatives.

Load capacity varies by OD and free length combination. Spring rate (N/mm) depends on wire diameter, OD, and number of active coils. Because this product covers a wide size matrix, specific spring rate values are not listed universally — contact us to confirm the spring rate for your selected size if your application has a defined load requirement.

Standard spring steel maintains its mechanical properties up to approximately 120–150 °C (248–302 °F). Above this range, the material may experience stress relaxation and loss of set resistance. For elevated-temperature applications, contact us to confirm suitability or discuss alternative materials.

Pack quantity varies by size — larger or longer springs are typically offered in smaller packs. For prototyping or single-unit builds, the 2 or 3 PCS pack is usually sufficient. For small-batch production, jig sets, or when you need spares on hand, the 5 PCS pack offers better per-unit value. Select the quantity that matches your build volume.

Closed ends mean the final coils are wound tightly against the adjacent coil, creating a solid end. Ground ends are then machined flat, providing a perpendicular seating surface. This reduces lateral buckling, improves load alignment, and ensures the spring sits squarely on its seat — important for precision assemblies and guided spring applications.