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When a project demands consistent return force and precise dimensional control, finding the right compression spring can be frustrating. Whether you are a hobbyist building custom mechanisms, a maker prototyping a device, or a technician replacing worn-out springs in equipment, mismatched dimensions lead to failed assemblies and wasted time. These compression springs are engineered to deliver repeatable elastic performance across a wide range of load and travel requirements.
Each spring features a 3mm wire diameter and an outer diameter ranging from 25mm to 30mm (approximately 0.98 in to 1.18 in), with free lengths spanning 20mm to 100mm (approximately 0.79 in to 3.94 in). The coil body is formed from spring steel, wound to close-pitch geometry for uniform load distribution along the full active length.
Typical use cases include compression spring replacement in mechanical assemblies, return-force elements in jigs and fixtures, cushioning components in DIY automation projects, and load-bearing inserts in 3D-printed enclosures or custom hardware builds.
Wire diameter 3mm, outer diameters 25 / 26 / 27 / 28 / 29 / 30mm, free lengths 20–100mm — select the exact combination your application requires.
Wound from spring steel wire for consistent elastic modulus, reliable return force, and resistance to permanent set under repeated cycling.
Uniform coil spacing distributes compressive load evenly across the active coils, reducing stress concentration and extending service life.
Designed to maintain spring rate across repeated compression cycles — suitable for both static preload and dynamic reciprocating applications.
Compatible with DIY mechanisms, prototype assemblies, jig fixtures, equipment maintenance, and light industrial replacement tasks.
Available in 1, 3, or 5-piece packs — order a single spring for testing or a multi-pack for batch builds and spares inventory.
| Wire Diameter | 3mm (0.118 in) |
|---|---|
| Outer Diameter Range | 25mm – 30mm (0.98 in – 1.18 in) |
| Free Length Range | 20mm – 100mm (0.79 in – 3.94 in) |
| Material | Spring steel |
| Coil Type | Close-pitch compression coil |
| End Type | See variant options |
| Surface Finish | See variant options |
| Spring Rate | See variant options |
| Available Quantities | 1 Pcs / 3 Pcs / 5 Pcs |
Measure the bore or guide rod your spring will seat against. The spring outer diameter should be slightly smaller than the bore (typically 0.5–1mm clearance) or slightly larger than the guide rod. For free length, select a spring that is longer than your required compressed height plus your desired travel distance. When in doubt, order a small quantity to test fit before committing to a larger pack.
All springs in this listing have a wire diameter of 3mm (0.118 in). The outer diameter varies by variant from 25mm to 30mm, and the free length varies from 20mm to 100mm. Select the combination that matches your dimensional requirements from the variant selectors above.
These springs are wound from spring steel and are suitable for light-to-medium load applications including DIY mechanisms, prototype assemblies, jig fixtures, and equipment maintenance. For heavy industrial or safety-critical load-bearing applications, please contact us to confirm the spring rate and load capacity for your specific variant before ordering.
Spring steel has moderate corrosion resistance under normal indoor conditions. For applications exposed to moisture, chemicals, or outdoor environments, consider applying a protective coating or lubricant, or contact us to confirm the surface finish of your selected variant. Stainless steel alternatives may be more appropriate for high-humidity or corrosive environments.
Yes. These compression springs are commonly used in 3D-printed assemblies, custom enclosures, and maker projects. Ensure your printed spring seat or guide rod is dimensioned to match the selected outer diameter variant. A 0.5–1mm clearance between the spring OD and the bore wall is recommended for smooth compression and extension.
All three quantity options contain identical springs of the same size and specification. The 1 Pcs option is ideal for testing fit and function before committing to a larger order. The 3 Pcs and 5 Pcs packs offer a lower per-unit cost and are suited for batch builds, multi-spring assemblies, or keeping spares on hand for maintenance.
Spring rate depends on wire diameter, outer diameter, free length, and number of active coils. Because this listing covers a wide size matrix, spring rate varies by variant. If your application requires a specific spring rate value, please contact us with your selected size combination and we will provide the specification or direct you to the appropriate variant.
