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When a project demands consistent return force in a compact space, finding the right compression spring can be frustrating — wrong outer diameter, wrong free length, or a wire gauge that collapses under load. These 1.8 mm wire diameter compression springs are engineered for hobbyists, makers, and small-scale mechanical engineers who need dependable elastic performance without over-engineering the solution.
Each spring is formed from steel wire with a fixed wire diameter of 1.8 mm (0.071 in). Outer diameters span 12–30 mm (0.47–1.18 in) and free lengths range from 15–100 mm (0.59–3.94 in), with packaging options of 5 or 10 pieces per order. The coil geometry delivers a consistent spring rate suited to light-to-medium load applications.
Typical use cases include DIY mechanical assemblies requiring controlled return force, small appliance repair where a worn coil spring needs replacement, robotics and automation prototyping calling for compact compression spring coil components, and jig or fixture builds where repeatable spring pressure is critical.
Fixed wire gauge across all variants ensures a consistent spring rate and predictable load-deflection behavior for repeatable mechanical performance.
Outer diameters from 12 to 30 mm and free lengths from 15 to 100 mm let you match the spring geometry to your exact application without custom fabrication.
Formed from steel wire to deliver the structural rigidity and fatigue resistance needed for repeated compression cycles in mechanical assemblies.
Available in 5-piece or 10-piece packs so you can order exactly what your project requires — no excess inventory, no shortage mid-build.
End coil geometry provides a flat seating surface for stable load transfer, reducing lateral deflection when the spring is compressed in a housing or against a plate.
Suited for DIY repairs, robotics prototyping, jig and fixture builds, small appliance maintenance, and any assembly requiring a compact coil spring with controlled return force.
| Wire Diameter | 1.8 mm (0.071 in) |
|---|---|
| Outer Diameter | 12–30 mm (0.47–1.18 in) — See variant options |
| Free Length | 15–100 mm (0.59–3.94 in) — See variant options |
| Material | Steel |
| Spring Type | Compression (coil) |
| End Type | See variant options |
| Spring Rate | See variant options |
| Surface Finish | See variant options |
| Packaging | 5 pcs or 10 pcs — See variant options |
Measure the bore or housing inner diameter where the spring will seat. The spring's outer diameter should be slightly smaller than the bore to allow free movement without binding. For guide rod applications, the spring's inner diameter (outer diameter minus twice the wire diameter) must clear the rod. Select the variant whose outer diameter best fits your housing dimensions.
Load capacity depends on the outer diameter, free length, and number of active coils — all of which vary by variant. A 1.8 mm wire gauge is suited to light-to-medium duty applications. For precise load and deflection values, contact us with your selected variant dimensions and we can provide further guidance.
These springs are formed from steel wire. Standard steel offers good mechanical properties but limited corrosion resistance in wet or chemically aggressive environments. For outdoor or humid applications, consider applying a protective coating after installation, or contact us to confirm finish options for your selected variant.
Free length is the spring's natural, unloaded length — the dimension listed in the variant options (15–100 mm). Compressed length (solid height) is the minimum length when all coils are touching. Your application's travel distance must fit within the range between free length and solid height. Ensure your assembly has sufficient clearance for the spring to operate within its working deflection range.
Yes. Steel compression springs are designed for repeated compression cycles. Performance longevity depends on operating stress levels relative to the spring's elastic limit. For high-cycle applications, avoid compressing the spring to solid height repeatedly, as this can cause set (permanent deformation). Operating within 80% of maximum deflection is a common guideline for extended service life.
The 5-piece pack is available for longer free lengths (60–100 mm), while the 10-piece pack covers shorter lengths (15–50 mm). Choose based on how many springs your project requires. If you need a specific quantity not listed, contact us to discuss bulk options.
To fit over a guide rod, the spring's inner diameter (outer diameter minus 3.6 mm for 1.8 mm wire) must exceed the rod's outer diameter with a small clearance. For example, a 1.8 × 12 mm variant has an approximate inner diameter of 8.4 mm. Verify your rod diameter against the selected variant's inner diameter before ordering.
