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When your repair or build demands a reliable small-diameter spring that won't fail under repeated cycling, finding the right size off the shelf can be a real challenge. Whether you're a hobbyist repairing a pen mechanism, an electronics technician replacing a battery contact spring, or a maker prototyping a custom mechanism, these 0.5mm wire diameter compression pressure springs give you the exact fit you need without over-engineering.
Each spring is manufactured from 0.5mm wire diameter stock, available in stainless steel (corrosion-resistant, ideal for humid or outdoor environments), spring steel (higher carbon content for stronger return force), and nickel plated (smooth finish for low-friction applications). Outer diameters range from approximately 2.5mm to 13.5mm (0.10"–0.53"), with free lengths spanning from 5mm to 300mm (0.20"–11.81"), covering a wide spectrum of compact to medium-length spring requirements.
These compression springs are well-suited for battery compartment contacts in consumer electronics, small mechanical assemblies in 3D printer extruders and CNC fixtures, pen and stylus click mechanisms, and light-duty valve or latch return applications in DIY automation projects.
| Wire Diameter | 0.5mm (0.020") |
|---|---|
| Outer Diameter Range | 2.5mm – 13.5mm (0.10" – 0.53") |
| Free Length Range | 5mm – 300mm (0.20" – 11.81") |
| Spring Type | Compression (open-coil) |
| Material Options | Stainless Steel / Spring Steel / Nickel Plated |
| Coil Direction | See variant options |
| Spring Rate | See variant options |
| Surface Finish | Natural (Stainless Steel & Spring Steel) / Nickel Plated |
| Pack Quantity | 2 Pcs / 5 Pcs / 10 Pcs (see variant options) |
| End Type | Closed & ground (typical for this wire diameter range) |
Match the outer diameter (OD) to your housing bore — the spring OD should be slightly smaller than the bore so it can compress freely. Then select a free length that gives you the desired preload and travel. For this product, the wire diameter is fixed at 0.5mm; choose the OD and free length from the variant options that best fit your assembly.
Stainless steel offers excellent corrosion resistance, making it the right choice for humid, wet, or outdoor environments. Spring steel (high-carbon steel) typically provides a higher elastic modulus and stronger return force for the same wire diameter, making it better suited for applications where maximum spring force is the priority and corrosion is not a concern.
The stainless steel variants are resistant to oxidation and mild corrosion, making them suitable for outdoor, humid, or lightly corrosive environments. Spring steel variants are not inherently corrosion-resistant and are better used in dry, indoor applications. Nickel plated variants offer a moderate level of surface protection against light moisture exposure.
These springs are commonly used in battery contact mechanisms, pen and stylus click assemblies, small valve and latch return systems, 3D printer extruder components, electronic switch mechanisms, and light-duty DIY automation fixtures. Always verify the spring's OD, free length, and estimated spring rate against your specific application requirements before installation.
Pack quantities vary by variant: options include 2 Pcs, 5 Pcs, and 10 Pcs. Select your preferred quantity from the Amount option when choosing your spring size and material. Larger packs are useful for prototyping or keeping spares on hand.
The three numbers represent: Wire Diameter × Outer Diameter × Free Length, all in millimeters. For example, "0.5 x 5 x 15mm" means a wire diameter of 0.5mm, an outer diameter of 5mm, and a free (uncompressed) length of 15mm. Use these three dimensions to match the spring to your housing and travel requirements.
Yes. The smaller OD variants (e.g., 2.5mm–5mm OD) are well-suited for battery contacts, pogo pin replacements, and PCB-mounted spring contacts. Stainless steel is recommended for electronics use due to its corrosion resistance and stable conductivity over time. Nickel plated variants also work well in low-current contact applications.
