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When a standard spring fails mid-project or the wrong size causes misalignment in a precision assembly, the cost in downtime and rework adds up fast. Engineers, hobbyists, and maintenance technicians who need a reliable compression spring in 2.5mm wire diameter — available in a range of outer diameters and lengths — will find this listing covers the most commonly specified sizes in a single place.
Each spring is wound from round steel wire with a nominal wire diameter of 2.5mm (0.098 in). Outer diameters span 22mm to 40mm (0.87 in to 1.57 in) and free lengths range from 30mm to 100mm (1.18 in to 3.94 in). The nickel-plated finish is applied over the base steel to provide a uniform, corrosion-resistant surface. Ends are closed and ground for flat, stable seating.
Typical applications include mechanical return mechanisms in industrial equipment, compression buffers in jigs and fixtures, valve spring replacements in fluid systems, and load-bearing elements in DIY automation and robotics builds. The wide size matrix makes these springs well suited for prototype development, spare-parts stocking, and small-batch production runs.
Consistent 2.5mm (0.098 in) round wire cross-section across all size variants for predictable load characteristics.
Outer diameters from 22mm to 40mm (0.87–1.57 in) cover a broad range of bore and housing sizes in a single listing.
Free lengths from 30mm to 100mm (1.18–3.94 in) allow selection of the correct working deflection for your assembly.
Electroplated nickel coating provides corrosion resistance and a clean, uniform appearance suitable for visible assemblies.
Closed and ground end coils deliver flat, stable seating surfaces that reduce lateral buckling and improve load alignment.
Available in packs of 1, 3, 5, 8, 10, or 20 pieces — order exactly what your project or maintenance stock requires.
| Wire Diameter | 2.5mm (0.098 in) |
|---|---|
| Outer Diameter Range | 22mm – 40mm (0.87 in – 1.57 in) |
| Free Length Range | 30mm – 100mm (1.18 in – 3.94 in) |
| End Type | Closed and Ground |
| Surface Finish | Nickel Plated |
| Spring Type | Compression |
| Winding Direction | See variant options |
| Material | Steel (nickel-plated) |
| Spring Rate | See variant options |
| Pack Size Options | 1 / 3 / 5 / 8 / 10 / 20 pcs |
Measure the bore or housing ID that the spring must fit inside — the spring OD should be 1–2mm smaller than the bore for clearance. For free length, select a spring whose free length is longer than your required working length by at least the amount of deflection needed. Use the variant selector to match Wire Dia × OD × Length to your spec.
Load capacity depends on the specific OD, free length, and number of active coils — all of which vary by variant. As a general guide, 2.5mm wire springs in this OD range are suited to light-to-medium duty applications. For precise load and deflection data, contact us with your selected variant dimensions.
Nickel plating offers good resistance to mild humidity and light moisture exposure. For prolonged outdoor or marine environments with salt spray or standing water, additional protective measures or a stainless steel spring may be more appropriate. These springs are well suited for indoor mechanical assemblies, enclosures, and protected outdoor fixtures.
Yes. The closed and ground ends provide flat seating surfaces compatible with standard spring pockets, retainers, and guide rods. Verify that your retainer ID is larger than the spring OD and that the guide rod OD is smaller than the spring ID (OD minus twice the wire diameter) to prevent binding.
These springs can function as valve return springs in low-pressure fluid systems where the fluid is compatible with nickel-plated steel. Confirm the spring rate and free length match your valve's cracking pressure and stroke requirements. For high-pressure or chemically aggressive media, consult a spring engineer before use.
Pack sizes of 1, 3, 5, 8, 10, and 20 pieces are offered so you can order the exact quantity needed — whether for a single prototype, a small repair job, or a production batch. All pieces in a pack are identical in dimensions and finish. Larger packs offer a lower per-unit cost.
Each variant is labeled in the format Wire Dia × Outer Dia × Free Length (all in mm). For example, "2.5×22×30mm" means 2.5mm wire, 22mm OD, 30mm free length. Cross-reference these three values against your engineering drawing or measured housing dimensions before adding to cart.
