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When a worn-out or missing compression spring causes a mechanism to fail — whether it's a pen, a valve, a latch, or a precision instrument — finding the exact replacement size is the real challenge. These stainless steel compression springs are designed for makers, repair technicians, and DIY enthusiasts who need reliable, dimensionally consistent coil springs in small wire diameters without ordering in bulk.
Each spring is wound from 0.3mm wire diameter stainless steel, with outer diameters ranging from 2mm to 6mm (approx. 0.08" to 0.24") and free lengths from 5mm to 305mm (approx. 0.2" to 12"). The stainless steel construction provides corrosion resistance suitable for both indoor and light outdoor applications. Available in packs of 1 or 10 pieces depending on your project needs.
Typical use cases include replacing compression springs in ballpoint pens and mechanical pencils, restoring spring tension in small latches and push-button mechanisms, and sourcing precision coil springs for electronics enclosures, hobby robotics, and model engineering projects where standard hardware store sizes are too large.
Wound from stainless steel wire for resistance to rust and oxidation, suitable for humid environments and long-term storage without degradation.
Consistent 0.3mm wire gauge across all variants ensures predictable spring rate and reliable fit in tight-clearance housings and bores.
Five outer diameter options and fifteen free length options let you match the exact spring geometry your repair or build requires.
Uniform coil spacing and closed ends provide stable seating and repeatable compression behavior across the full stroke range.
Order a single spring for a one-off repair or a pack of 10 for prototyping, batch repairs, or keeping spares on hand.
Ideal for pens, push-button latches, small valves, sensor housings, hobby electronics, and model engineering assemblies where compact spring geometry is critical.
| Material | Stainless Steel |
|---|---|
| Wire Diameter | 0.3mm (approx. 0.012") |
| Outer Diameter (OD) | 2mm / 3mm / 4mm / 5mm / 6mm (approx. 0.08"–0.24") |
| Free Length | 5mm – 305mm (approx. 0.2" – 12") — See variant options |
| Spring Type | Compression (closed ends) |
| Coil Direction | See variant options |
| Spring Rate | See variant options |
| Surface Finish | Natural stainless (uncoated) |
| Pack Quantity | 1 piece or 10 pieces — See variant options |
| Weight (per pack) | See variant options |
Measure the bore or housing your spring sits inside — the spring's outer diameter should be slightly smaller than the bore to allow free movement without binding. For a spring that fits over a rod or pin, the inner diameter (OD minus 2× wire diameter) should be slightly larger than the rod. With a 0.3mm wire, inner diameters range from approximately 1.4mm (OD 2mm) to 5.4mm (OD 6mm).
The free length is the uncompressed length of the spring. Measure your existing spring at rest, or measure the available travel distance in your mechanism and add your required preload length. Available free lengths range from 5mm to 305mm — select the variant closest to your target dimension.
Yes. Stainless steel provides good resistance to rust and oxidation compared to carbon steel springs. These are suitable for humid indoor environments, light outdoor exposure, and applications where occasional moisture contact is expected. For fully submerged or highly corrosive chemical environments, verify compatibility with your specific conditions.
Spring rate depends on wire diameter, outer diameter, free length, and number of active coils — all of which vary by variant. Because these are small-diameter, fine-wire springs, they are suited to light-duty applications requiring low to moderate force. If you need a specific spring rate value, contact us with your selected variant dimensions and we can provide further guidance.
Yes — these are a common replacement for springs in ballpoint pens, retractable pencils, push-button latches, and small click mechanisms. The 0.3mm wire diameter and 2–6mm OD range matches the geometry of most standard pen and small latch springs. Select the OD and length that matches your original spring.
If you're replacing a single broken spring in a known application, the 1-piece option is sufficient. If you're prototyping, doing batch repairs, or want spares on hand for future use, the 10-piece pack offers better value per spring. Note that some size/length combinations are only available in packs of 10 or as single pieces — check the variant selector for availability.
Yes. The small wire diameter and compact OD range make these well-suited for electronics enclosures, battery contacts, sensor actuators, and hobby robotics builds where standard hardware springs are too large. The stainless steel material also avoids magnetic interference concerns present with some carbon steel springs.
