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When a project demands consistent push-back force in a compact space, finding the right compression spring can be frustrating — wrong wire diameter, wrong free length, or a coil that collapses under load. These steel compression springs with a 2.5 mm wire diameter are designed for engineers, hobbyists, and maintenance professionals who need a dependable, off-the-shelf solution without custom tooling.
Each spring is wound from carbon steel wire with a wire diameter of 2.5 mm (0.098 in) and an outer diameter ranging from 12 mm to 25 mm (0.47–0.98 in). Free lengths span from 20 mm to 305 mm (0.79–12.0 in), giving you a wide selection to match your exact travel and load requirements. The coil ends are typically closed and ground for stable seating.
These compression springs suit a broad range of use cases: replacing worn-out return springs in small machinery and jigs, providing cushioning force in DIY drawer slides and cabinet mechanisms, and acting as tension-relief elements in custom fabrication projects requiring precise spring-back force in tight bore diameters.
Consistent 2.5 mm (0.098 in) wire cross-section delivers uniform spring rate and predictable load deflection across all size variants.
Outer diameters from 12 mm to 25 mm and free lengths from 20 mm to 305 mm let you match the spring precisely to your bore and travel requirements.
Wound from carbon steel wire for solid tensile strength and reliable elastic return under repeated compression cycles in mechanical assemblies.
Closed and ground end coils provide flat, stable seating surfaces that reduce lateral buckling and ensure even load distribution on spring seats.
Available in packs of 2 pcs or 5 pcs so you can stock spares for maintenance kits or order just what you need for a single repair job.
Suited for DIY mechanisms, light industrial jigs, cabinet hardware, and custom fabrication projects requiring controlled return force in compact spaces.
| Wire Diameter | 2.5 mm (0.098 in) |
|---|---|
| Outer Diameter | 12–25 mm (0.47–0.98 in) — See variant options |
| Free Length | 20–305 mm (0.79–12.0 in) — See variant options |
| Material | Carbon Steel |
| End Type | Closed & Ground |
| Spring Type | Compression (Coil) |
| Spring Rate | See variant options |
| Surface Finish | See variant options |
| Pack Quantity | 2 pcs or 5 pcs — See variant options |
Measure the bore or housing inner diameter where the spring will sit. The spring's outer diameter should be slightly smaller than the bore to allow free movement without binding. For a shaft-guided spring, the inner diameter (outer diameter minus twice the wire diameter) should clear the shaft with a small gap. Use the variant selector above to pick the outer diameter that fits your assembly.
Free length is the uncompressed length of the spring. Choose a free length longer than your required working travel plus the solid height (number of coils × wire diameter). A common rule is: free length = solid height + maximum travel + a small safety margin. If you are replacing an existing spring, measure its free length when fully relaxed.
Load capacity depends on the specific outer diameter and free length combination you select, as these determine the number of active coils and the resulting spring rate. Carbon steel at 2.5 mm wire diameter provides solid elastic force for light-to-medium duty applications. For precise load requirements, contact us to confirm the spring rate for your chosen variant.
These springs are made from carbon steel, which offers good mechanical strength but limited corrosion resistance in wet or chemically aggressive environments. For outdoor or humid applications, consider applying a light coat of oil or grease, or contact us about stainless steel alternatives if corrosion resistance is a priority.
Yes — the closed and ground ends provide flat seating surfaces compatible with standard spring cups, retainers, and machined pockets. Verify that your seat diameter accommodates the outer diameter of the spring you select. The flat ends also reduce the risk of the spring tilting or walking under load.
If you are completing a one-off repair or prototype, the 2-piece pack gives you a spare without over-ordering. For maintenance kits, production jigs, or projects requiring multiple springs of the same size, the 5-piece pack offers better value per unit. Both pack sizes contain identical springs — only the quantity differs.
These are designed exclusively as compression springs — they resist and return force when compressed along their axis. They are not suitable for tension (extension) applications. If you need a tension spring, please search our store for extension springs with the appropriate wire and outer diameter.
