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When a mechanism fails because a worn-out spring can no longer hold its load, the cost is downtime, rework, and frustration. Whether you are a hobbyist building a custom jig, a maintenance technician replacing worn components, or a small-batch manufacturer sourcing reliable hardware, you need compression springs that deliver consistent force cycle after cycle.
This listing covers a pack of 10 spring steel compression springs with a wire diameter of 2.5 mm (0.098 in). Outer diameters span 12–36 mm (0.47–1.42 in) and free lengths range from 20–100 mm (0.79–3.94 in) across the available variants. The springs are wound from carbon spring steel, giving them a firm, resilient character suited to moderate-to-heavy duty push-back applications.
Typical use cases include compression spring replacement in mechanical assemblies, DIY tool and fixture design requiring a spring steel compression spring with precise OD control, and small-scale industrial or maker-space projects where a reliable pressure spring with a 2.5 mm wire diameter is specified. The wide outer-diameter range (12–36 mm) also makes these springs a practical choice for compression spring size selection across multiple project types in a single order.
Wound from carbon spring steel wire for firm, consistent elastic return and resistance to permanent set under repeated loading cycles.
Uniform 2.5 mm wire diameter across all variants ensures predictable spring rate and straightforward substitution in existing designs.
Outer diameters from 12 mm to 36 mm let you match the spring to your bore or housing without custom fabrication.
Free lengths from 20 mm to 100 mm cover a broad stroke range, reducing the need to source springs from multiple suppliers.
Each order ships 10 identical springs, giving you spares for prototyping, batch builds, or maintenance stock without overpaying for bulk quantities.
Springs in this wire-diameter class typically feature closed and ground ends for flat, stable seating on spring pads and in recessed housings.
| Material | Carbon spring steel |
|---|---|
| Wire Diameter | 2.5 mm (0.098 in) |
| Outer Diameter (OD) | 12–36 mm (0.47–1.42 in) — see variant options |
| Free Length | 20–100 mm (0.79–3.94 in) — see variant options |
| End Type | Closed and ground (typical for this wire class) |
| Spring Rate | See variant options |
| Surface Finish | Natural steel (uncoated) |
| Quantity per Pack | 10 pieces |
| Wind Direction | Right-hand (standard) |
| Application | General mechanical, DIY, industrial fixtures |
Measure the bore or housing that will guide the spring. The spring OD should be 1–2 mm smaller than the bore diameter to allow free movement without binding. For a shaft-guided spring, the shaft OD should be 1–2 mm smaller than the spring inner diameter (ID = OD minus twice the wire diameter, so ID ≈ OD − 5 mm for this 2.5 mm wire). Select your OD from the variant dropdown above.
The free length should be longer than your required working length by at least the compressed travel you need. As a starting point, choose a free length that is 20–30% longer than the installed (compressed) length. If you need 60 mm of working length with 15 mm of travel, a 80–100 mm free-length spring is a reasonable starting point.
With a 2.5 mm wire diameter, these springs deliver moderate-to-firm spring rates suitable for general mechanical assemblies, tooling fixtures, and light industrial applications. For very heavy loads (e.g., automotive valve springs or heavy press tooling), a larger wire diameter or die spring would be more appropriate. Contact us if you need load data for a specific variant.
The springs are made from carbon spring steel with a natural (uncoated) finish. They are not stainless steel and will oxidise if exposed to moisture over time. For outdoor or wet environments, apply a light coat of oil or grease, or consider stainless steel springs. For dry indoor or enclosed mechanical applications, the natural finish performs well.
Yes — the OD range of 12–36 mm covers many standard spring housing sizes used in general engineering and DIY applications. Always verify the bore diameter, shaft diameter (if applicable), and seat depth of your housing against the specific variant dimensions before ordering.
Buying in packs of 10 gives you spares for prototyping iterations, replacements during maintenance, and batch production without committing to large bulk quantities. It also reduces per-unit cost compared to single-piece sourcing, making it practical for both hobbyists and small-scale manufacturers.
Yes. You will need the wire diameter (2.5 mm), outer diameter, free length, and number of active coils. The number of active coils varies by variant — contact us to confirm coil count for your selected size if you need precise load calculations.
