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When a mechanism fails because a spring loses tension too quickly or deforms under repeated load, the root cause is almost always the wrong material. Engineers, hobbyists, and makers who need reliable, repeatable force in compact assemblies require a spring that holds its geometry cycle after cycle. These compression springs are wound from spring steel wire and are sized for applications where space is tight and dimensional accuracy matters.
Each spring is wound from spring steel wire with a wire diameter of 0.5mm. Outer diameters range from 3mm to 12mm (approx. 0.12–0.47 in), and free lengths span 5mm to 100mm (approx. 0.20–3.94 in). Springs are available in packs of 5 or 10 pieces depending on the selected variant.
Typical use cases include small-load return mechanisms in 3D printer extruder assemblies, pen and stylus click mechanisms requiring consistent tactile force, lightweight valve or latch return springs in DIY robotics, and precision jig fixtures where repeatable spring force is critical to part alignment.
| Material | Spring Steel |
|---|---|
| Wire Diameter | 0.5mm (approx. 0.020 in) |
| Outer Diameter (OD) | 3mm – 12mm (approx. 0.12–0.47 in) |
| Free Length | 5mm – 100mm (approx. 0.20–3.94 in) |
| Spring Type | Compression |
| End Type | See variant options |
| Spring Rate | See variant options |
| Surface Finish | See variant options |
| Pack Quantity | 5 Pcs or 10 Pcs (see variant options) |
| Coil Direction | See variant options |
Measure the bore or housing that will guide the spring to determine the maximum allowable OD. Then measure the required travel distance and add your desired preload length to estimate the free length you need. For guided applications, the spring OD should be slightly smaller than the bore ID to allow free movement without binding.
A 0.5mm wire diameter is suited for light-duty compression loads, typically in the range of a few grams to a few hundred grams depending on OD and free length. Shorter springs with larger ODs will have higher spring rates. If your application requires heavier loads, consider a larger wire diameter variant.
Spring steel offers good mechanical properties but has limited corrosion resistance compared to stainless steel. For indoor or dry environments these springs perform reliably. For humid, wet, or chemically exposed environments, consider applying a protective coating or selecting a stainless steel alternative.
Yes. The compact OD range (3–12mm) and fine wire diameter make these springs well suited for 3D printer extruder mechanisms, servo linkages, gripper return springs, and similar light-load robotics applications where precise, repeatable spring force is needed in a small envelope.
Both packs contain identical springs — the only difference is quantity. The 10-piece pack is available for shorter length variants (5–50mm free length), while the 5-piece pack covers longer length variants (60–100mm free length). Select the pack size that matches your project needs and the specific Wire Dia x OD x L combination you require.
Check three dimensions: (1) OD must clear the housing bore with a small gap, typically 0.1–0.3mm; (2) the inner diameter (OD minus 2× wire dia) must clear any guide pin; (3) the free length must fit within the available cavity depth with room for the required compression travel. The variant name format is Wire Dia × OD × Free Length in mm, giving you all three key values directly.
Yes. Short free-length variants (5–20mm) with ODs of 3–6mm are commonly used in pen click mechanisms, small latches, and push-button return assemblies. The 0.5mm wire diameter provides a light, consistent tactile force appropriate for these applications.
