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When a worn-out spring causes a mechanism to fail — whether it's a pen, a small appliance, a sensor assembly, or a hobby model — finding the exact replacement can be frustrating. These mini compression springs are designed for makers, hobbyists, electronics repair technicians, and DIY enthusiasts who need reliable, dimensionally consistent springs in small sizes without ordering in bulk from industrial suppliers.
Each spring is formed from spring steel wire with a diameter of 0.9mm (approx. 0.035 in). Outer diameters range from 5mm to 14mm (approx. 0.20–0.55 in), and free lengths span 10mm to 100mm (approx. 0.39–3.94 in). Springs are supplied in packs of 5 or 10 pieces depending on the selected length variant.
Typical use cases include replacing compression springs in ballpoint pens and mechanical pencils, restoring spring tension in small electronic enclosures and battery contacts, and providing return force in DIY robotics, 3D printer components, and custom jig fixtures where a compact, low-load spring is required.
| Wire Diameter | 0.9mm (approx. 0.035 in) |
|---|---|
| Outer Diameter | 5mm – 14mm (approx. 0.20–0.55 in) — See variant options |
| Free Length | 10mm – 100mm (approx. 0.39–3.94 in) — See variant options |
| Material | Spring Steel |
| End Type | Closed ends |
| Spring Type | Compression |
| Load Type | Light duty |
| Spring Rate | See variant options |
| Quantity per Pack | 5 pcs (lengths 60–100mm) / 10 pcs (lengths 10–50mm) |
| Finish | Natural / uncoated spring steel |
Measure the bore (hole) or post your spring will seat against. For a bore-mounted spring, the outer diameter should be slightly smaller than the bore ID — typically 0.2–0.5mm clearance. For a post-mounted spring, the inner diameter (outer diameter minus 2× wire diameter) should be slightly larger than the post OD. Use our variant selector to pick the outer diameter that fits your measured dimensions.
The free length is the uncompressed length of the spring. Select a free length that is longer than your required working length. The difference between free length and working length is the deflection, which determines how much force the spring exerts. If you need a specific spring rate, contact us to confirm before ordering.
With a 0.9mm wire diameter, these are light-duty compression springs suited for low-load applications such as pen mechanisms, battery contacts, sensor plungers, and small model assemblies. They are not intended for heavy industrial or high-cycle fatigue applications. If you need a higher spring rate, consider a larger wire diameter or outer diameter variant.
These springs are made from uncoated spring steel and offer moderate corrosion resistance suitable for indoor, dry environments. For applications exposed to moisture, humidity, or mild chemicals, we recommend applying a light coat of machine oil after installation, or contact us about stainless steel alternatives if available.
Yes. The 0.9mm wire diameter and range of outer diameters and lengths make these springs well-suited for 3D printer extruder assemblies, bed leveling mechanisms, and lightweight robotic linkages. Verify the outer diameter and free length against your specific component dimensions before ordering.
Pack quantity depends on the length variant selected. Springs with free lengths of 10mm through 50mm are supplied in packs of 10 pieces. Springs with free lengths of 60mm through 100mm are supplied in packs of 5 pieces. The quantity is shown in the variant name (e.g., "30mm & 10pcs").
The listed variants cover wire diameter 0.9mm with outer diameters from 5mm to 14mm and free lengths from 10mm to 100mm. If you need a size outside this range, please contact us through the store's contact page with your required wire diameter, outer diameter, free length, and quantity, and we will advise on availability.
