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When a project demands consistent, repeatable spring force — whether you're repairing a mechanism, prototyping a device, or replacing a worn-out component — finding the right compression spring in the right size is half the battle. These spring steel compression springs are stocked in an extensive range of wire diameters and outer diameters so engineers, hobbyists, and repair technicians can find an exact match without custom ordering.
Each spring is wound from spring steel wire with diameters ranging from 0.3 mm to 5 mm (approximately 0.012 in to 0.197 in) and outer diameters spanning 2 mm to 80 mm (approximately 0.079 in to 3.15 in). The free length is 300 mm (approximately 11.81 in). The open-coil helical design allows axial compression under load and returns to free length when the load is removed.
Typical applications include compression spring replacement in industrial machinery, return springs in jigs and fixtures, buffer springs in automotive and bicycle components, and prototype spring mechanisms in maker and robotics projects. Long-tail use cases include small-diameter compression springs for electronics enclosures, medium-bore springs for pneumatic valve returns, and large-OD springs for heavy-duty press tooling.
Wire diameters from 0.3 mm to 5 mm and outer diameters from 2 mm to 80 mm cover a broad spectrum of mechanical applications in a single product line.
Wound from spring steel wire for consistent elastic return, resistance to permanent set, and reliable performance across repeated compression cycles.
A 300 mm (11.81 in) free length provides ample working travel for applications requiring significant stroke, and can be cut to shorter lengths if needed.
The open-coil geometry allows smooth, linear compression under axial load and full return to free length upon load removal, minimising hysteresis.
Suitable for machinery repair, prototype builds, robotics, automotive components, jigs, fixtures, and general DIY mechanical projects.
Available per piece so you can order exactly the quantity you need — no minimum pack sizes forcing you to stock excess inventory.
| Product Type | Compression Spring |
|---|---|
| Material | Spring Steel |
| Wire Diameter Range | 0.3 mm – 5 mm (0.012 in – 0.197 in) |
| Outer Diameter Range | 2 mm – 80 mm (0.079 in – 3.15 in) |
| Free Length | 300 mm (11.81 in) |
| Spring Type | Open-Coil Helical Compression |
| End Type | See variant options |
| Surface Finish | See variant options |
| Spring Rate | See variant options |
| Quantity per Order | 1 piece (per variant selected) |
Start with the space constraints of your assembly: the outer diameter must fit inside any bore or housing, and the wire diameter determines the spring rate and load capacity. Heavier loads require a larger wire diameter. If you are replacing an existing spring, measure the wire diameter with calipers and the outer diameter across the coils. Select the variant that matches those measurements.
Spring rate depends on the specific wire diameter, outer diameter, number of active coils, and material modulus. Because this product spans a wide range of sizes, the spring rate varies by variant. If you require a specific spring rate (N/mm or lbf/in), please contact us with your wire diameter and outer diameter selection so we can provide guidance.
These springs are made from spring steel, which offers good mechanical properties but has limited inherent corrosion resistance compared to stainless steel. For outdoor, humid, or chemically exposed environments, consider applying a protective coating after installation, or contact us to enquire about stainless steel alternatives.
Yes, spring steel compression springs can be cut to a shorter free length using an angle grinder or spring cutter. Note that cutting changes the number of active coils and therefore alters the spring rate. Grind the cut end flat to ensure even seating. Always wear appropriate eye and hand protection when cutting springs.
These springs are suitable for a wide range of applications including machinery repair and maintenance, prototype and maker projects, robotics actuator returns, automotive and bicycle component buffers, pneumatic valve returns, jig and fixture clamping mechanisms, and general DIY mechanical assemblies. The broad size range means a single product line covers both miniature electronics enclosure springs and larger industrial press springs.
Measure the bore or housing inner diameter — the spring outer diameter should be slightly smaller (typically 0.5–2 mm clearance). Measure the shaft or guide rod outer diameter — the spring inner diameter (OD minus 2× wire diameter) should be slightly larger than the rod. Confirm the 300 mm free length provides sufficient working stroke for your compressed and extended positions. If in doubt, contact us with your assembly dimensions.
300 mm is the free length — the length of the spring when no load is applied. The compressed (solid) length will be shorter and depends on the number of coils and wire diameter of the specific variant. The working travel (deflection) is the difference between the free length and the compressed length under your applied load.
