1M Compression Spring Spring Steel Extra Long Pressure Coil Wire Dia 0.3mm-4.5mm

Wire diameter determines the spring rate and load capacity — thicker wire produces a stiffer spring. Coil width (outer diameter) must fit inside your housing bore with clearance, and the inner diameter must clear your guide rod or shaft. Start by identifying your maximum load, required deflection, and available space, then select the wire/width combination that meets those constraints. If in doubt, order a slightly larger wire diameter for a stiffer response.

Yes. The 1000mm format is specifically designed to be cut to your required free length using a rotary cutting tool or spring cutter. After cutting, lightly dress the cut end to remove any burrs. Note that cutting changes the number of active coils, which affects the spring rate — shorter cut lengths from the same wire/width will be stiffer.

Spring steel is engineered for elastic deformation — it returns to its original shape after each compression cycle without permanent set, provided it is not compressed beyond its solid height. For long service life, avoid compressing the spring to coil-bind (solid height) during normal operation. Fatigue life depends on the applied load range and cycle frequency; for high-cycle applications, keep the working stress well below the material's endurance limit.

Spring steel provides moderate oxidation resistance suitable for dry indoor environments. For humid, wet, or outdoor applications, we recommend applying a rust-inhibiting coating, oil, or protective spray after installation. If long-term corrosion resistance is critical, consider stainless steel spring alternatives for your application.

Both pack options contain the same spring in the same size. The 1-piece pack is suited for single-unit prototyping or replacement, while the 2-piece pack provides a spare or allows you to build symmetric assemblies (such as paired spring mounts) without placing a second order. Select your preferred quantity in the Pack of Quantity option above.

The coil width listed in the size option is the outer diameter (OD) of the spring. Your housing bore should be at least 0.5–1mm larger than the OD for clearance. The inner diameter (ID) is approximately OD minus twice the wire diameter — your guide rod should be at least 0.3–0.5mm smaller than the ID to allow free movement without binding. Always confirm fit with a test assembly before final installation.

For 3D printer bed leveling, wire diameters of 0.5mm–1.0mm with coil widths of 6mm–10mm are commonly used. For robotic gripper return springs, 0.3mm–0.8mm wire with narrower coil widths (2mm–6mm) suits compact finger mechanisms. For heavier robotic joints or clamping fixtures, 1.5mm–3.0mm wire with wider coils provides the necessary load capacity. Refer to your design's required spring force and deflection to confirm the selection.