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When a repair stalls because you can't find a spring small enough, or a prototype fails because the off-the-shelf option is the wrong length, the problem is almost always sourcing. These small compression springs are stocked specifically for engineers, hobbyists, and repair technicians who need exact dimensions in compact wire diameters — without ordering a factory minimum.
Each pack contains 10 springs made from carbon steel wire with a diameter of 0.9 mm or 1.0 mm. Outer diameters span 5 mm to 20 mm (approximately 0.20 in to 0.79 in), and free lengths range from 10 mm to 50 mm (approximately 0.39 in to 1.97 in). The format is wire diameter × outer diameter × free length — for example, 0.9×8×25mm means 0.9 mm wire, 8 mm OD, 25 mm free length. Select your exact size from the variant dropdown above.
Typical use cases include small appliance repair (pen mechanisms, clicker buttons, battery contacts), precision instrument assembly (gauges, sensors, valve actuators), and DIY electronics projects requiring consistent return force in tight spaces. The compact OD range also suits model-making and robotics prototyping where standard spring sizes are too large.
| Wire Diameter | 0.9 mm or 1.0 mm (see variant options) |
|---|---|
| Outer Diameter (OD) | 5 mm – 20 mm (see variant options) |
| Free Length | 10 mm – 50 mm (see variant options) |
| Material | Carbon steel |
| End Type | Open, non-ground |
| Spring Type | Compression |
| Coil Direction | See variant options |
| Surface Finish | See variant options |
| Spring Rate | See variant options |
| Pack Quantity | 10 pcs per pack |
The three numbers represent: wire diameter × outer diameter × free length. So 0.9×8×25mm means the wire is 0.9 mm thick, the spring's outer diameter is 8 mm, and its uncompressed (free) length is 25 mm. Select the combination that matches your application from the Sizes dropdown.
The inner diameter (ID) equals the outer diameter minus twice the wire diameter. For example, a 0.9×8×25mm spring has an ID of approximately 8 − (2 × 0.9) = 6.2 mm. Use this to check guide pin clearance before ordering.
These are light-duty compression springs suited for small mechanisms, electronics, instruments, and similar low-to-medium load applications. They are not rated for heavy structural or high-cycle industrial use. For load-critical applications, verify the spring rate and solid height against your design requirements.
The springs are made from carbon steel, which can oxidize if exposed to moisture or corrosive environments over time. For humid or outdoor applications, consider applying a light protective coating or selecting a stainless steel alternative. For dry indoor use, carbon steel performs reliably.
Yes. The small wire diameters (0.9–1.0 mm) and compact OD range (5–20 mm) make these well-suited for battery contacts, push-button mechanisms, connector springs, and similar PCB or enclosure applications. Confirm the free length and OD fit your housing before ordering.
A thicker wire (1.0 mm) produces a stiffer spring with a higher spring rate for the same OD and length. Choose 0.9 mm wire for lighter return force or tighter space constraints, and 1.0 mm wire when you need slightly more resistance. Both are available across the same OD and length range in the variant selector.
Each variant is sold as a pack of 10 identical springs. This gives you spares for prototyping, batch repairs, or replacement inventory without needing to reorder frequently.
