Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.
When a mechanism fails because a spring loses tension too soon, the cost goes beyond the part itself — downtime, rework, and frustration follow. Engineers, makers, and maintenance professionals who need consistent, repeatable spring force turn to compression coil springs with a proven wire diameter and material specification. These 2.5mm wire diameter springsteel compression springs are engineered for applications where load capacity and fatigue life matter.
Each spring is formed from spring steel wire with a nominal wire diameter of 2.5 mm (approx. 0.098 in). Outer diameters span 12 mm to 40 mm (approx. 0.47 in – 1.57 in), and free lengths range from 20 mm to 305 mm (approx. 0.79 in – 12.0 in). The helical coil geometry provides linear load-deflection characteristics across the working range.
Typical use cases include compression spring replacement in industrial jigs and fixtures, return-spring assemblies in DIY automation projects, valve and plunger mechanisms in fluid control systems, and load-bearing suspension elements in lightweight mechanical prototypes. Long-tail applications such as "2.5mm wire compression spring for 3D printer extruder" and "springsteel coil spring for door latch mechanism" are well served by the available size matrix.
| Wire Diameter | 2.5 mm (0.098 in) |
|---|---|
| Outer Diameter (OD) | 12 mm – 40 mm (0.47 in – 1.57 in) — See variant options |
| Free Length | 20 mm – 305 mm (0.79 in – 12.0 in) — See variant options |
| Material | Spring Steel (Springsteel) |
| Spring Type | Compression (Helical Coil) |
| End Type | See variant options |
| Surface Finish | See variant options |
| Spring Rate | See variant options |
| Pack Quantity | 5 pcs (lengths ≤100 mm) / 2 pcs (lengths ≥120 mm) |
| Coil Direction | Right-hand (standard) |
Measure the bore or housing that the spring will sit inside, then select an OD that provides a small clearance — typically 0.5 mm to 1 mm smaller than the bore diameter. For a guide rod application, measure the rod and select an inner diameter (OD minus twice the wire diameter) that gives 0.5 mm or more clearance around the rod. Use the variant selector above to browse all available OD options from 12 mm to 40 mm.
Load capacity depends on the outer diameter, free length, number of active coils, and material. A 2.5 mm wire diameter spring steel coil spring is suited for light-to-medium duty applications. For precise load and deflection values, apply the standard spring rate formula (G × d⁴) / (8 × D³ × n) using the spring's specific geometry, or contact us with your load requirements for guidance.
Spring steel provides good mechanical properties but has limited inherent corrosion resistance compared to stainless steel. For outdoor, humid, or mildly corrosive environments, consider applying a light coat of oil or grease, or use a protective sleeve. If your application requires stainless steel springs, please contact us to confirm availability.
These are open-coil compression springs designed to resist compressive loads only. They are not suitable for tension (extension) applications. For tension applications, an extension spring with hooks is required. Ensure your assembly compresses the spring axially within its working deflection range — do not compress beyond solid height.
Free length is the unloaded length of the spring. To select the correct free length, determine the installed (compressed) length your assembly requires and add the expected deflection under working load. For example, if your mechanism needs 30 mm of travel and the spring will be compressed to 40 mm at full load, you need a free length of at least 70 mm. Browse lengths from 20 mm to 305 mm in the variant selector above.
Shorter springs (free lengths up to 100 mm) are sold in packs of 5 pieces, which suits prototyping, small repairs, and multi-spring assemblies. Longer springs (free lengths of 120 mm and above) are sold in packs of 2 pieces, reflecting their larger material volume and typical single-spring usage in longer stroke mechanisms. The pack quantity is shown in the variant name alongside the length.
Yes — 2.5 mm wire diameter compression springs are commonly used in 3D printer extruder tensioner arms, hotend mounts, and bed leveling assemblies. Select an OD and free length that matches your printer's spring seat geometry. The 12 mm and 14 mm OD variants with lengths of 20–40 mm are frequently used in extruder and bed-leveling applications.
