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When a loose mechanism rattles, a valve fails to seat, or a jig loses its return force, the culprit is almost always an undersized or worn-out compression spring. Engineers, machinists, and hands-on DIYers who need reliable, repeatable spring force in tight spaces rely on correctly specified small compression springs — and finding the exact wire diameter and outer diameter combination in one place is rarely easy.
These compression springs are manufactured from spring steel wire with diameters of 1.2 mm, 1.5 mm, 1.6 mm, and 1.8 mm. Outer diameters range from approximately 6 mm to 24.5 mm (roughly 0.24 in to 0.96 in), and free lengths span 10 mm to 150 mm (0.39 in to 5.91 in). The close-wound coil geometry delivers consistent axial load across the full compression stroke, with a tightly controlled pitch for predictable spring rate.
Typical use cases include electronic enclosure button returns, automotive sensor brackets, pneumatic valve assemblies, 3D-printer extruder tensioners, and precision jig clamping fixtures — anywhere a compact, repeatable push force is required in a confined bore or housing.
Available in 1.2 mm, 1.5 mm, 1.6 mm, and 1.8 mm wire gauges to match a wide range of load and deflection requirements.
Outer diameters from 6 mm to 24.5 mm (≈ 0.24–0.96 in) cover most standard spring pockets in mechanical assemblies.
Free lengths from 10 mm to 150 mm (0.39–5.91 in) let you dial in the exact travel and preload your design needs.
Made from spring steel wire for consistent elastic return, resistance to set under repeated cycling, and long service life.
Uniform pitch and coil spacing deliver a linear spring rate and predictable axial force throughout the compression stroke.
Order as 1 PCS, 5 PCS, or 10 PCS to suit prototyping, small-batch production, or stocking your workshop spare-parts drawer.
| Material | Spring Steel |
|---|---|
| Wire Diameter | 1.2 mm / 1.5 mm / 1.6 mm / 1.8 mm |
| Outer Diameter (OD) | 6 mm – 24.5 mm (approx. 0.24 – 0.96 in) |
| Free Length | 10 mm – 150 mm (approx. 0.39 – 5.91 in) |
| Spring Type | Compression (axial load) |
| Coil Style | Close-wound, cylindrical |
| Spring Rate | See variant options |
| Surface Finish | See variant options |
| Packing Quantity | 1 PCS / 5 PCS / 10 PCS (select above) |
Wire diameter determines the spring's load capacity and stiffness. A thicker wire (e.g., 1.8 mm) produces a stiffer spring with higher load capacity, while a thinner wire (e.g., 1.2 mm) gives a softer, more compliant spring. Match the wire diameter to your required spring rate and the space available in your assembly.
The outer diameter of the spring should be slightly smaller than the bore or pocket it sits in — typically 0.5–1 mm of clearance is recommended. For a 10 mm bore, choose an OD of approximately 9–9.5 mm. Check the variant options for the exact OD before ordering.
These springs are made from spring steel, which offers good mechanical properties but has limited inherent corrosion resistance. For outdoor, humid, or chemically exposed environments, consider applying a protective coating or lubricant after installation. If corrosion resistance is a primary requirement, contact us to confirm finish options.
Spring steel is specifically formulated to resist permanent set (taking a "set" under load) during repeated compression cycles. Under normal operating conditions within the spring's rated deflection range, these springs maintain consistent return force over extended service life. Avoid compressing beyond the solid height to prevent premature fatigue.
Yes. Small compression springs in the 1.2–1.5 mm wire diameter range are commonly used in 3D printer extruder arms, bed-leveling assemblies, and filament tensioners. Select the OD and free length that match your printer's spring pocket dimensions and the preload force specified in your printer's documentation.
Free length is the overall length of the spring when no load is applied. Compressed length (solid height) is the minimum length when all coils are touching. Your working stroke must fit between these two values. Select a free length that provides adequate preload and travel within your assembly's available space.
Yes. Many variants are available in a 1 PCS option, allowing you to verify fit, load, and deflection in your application before committing to a 5 PCS or 10 PCS pack. Select the "1 PCS" packing quantity from the variant selector above.
