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When a mechanical assembly fails because a spring loses tension or snaps under load, the entire project stalls. Engineers, repair technicians, and hands-on DIYers who work with small-scale mechanisms need a reliable source of compression springs that ship in exact, usable dimensions — not vague bulk lots. These 0.8mm wire diameter compression springs are sized for precision work where space is tight and consistent spring force matters.
Each spring is formed from 0.8mm wire diameter steel, with outer diameters (O.D.) ranging from 5mm to 14mm (approximately 0.20 in to 0.55 in) and free lengths from 10mm to 50mm (approximately 0.39 in to 1.97 in). Available in packs of 10 or 50 pieces, they suit both prototyping runs and larger repair batches.
Typical applications include small appliance repair springs, pen and click-mechanism compression springs, electronic device button return springs, light-duty valve and plunger assemblies, and hobby robotics or RC component builds requiring compact compression elements.
| Wire Diameter | 0.8mm (0.031 in) |
|---|---|
| Outer Diameter (O.D.) | 5mm – 14mm (0.20 in – 0.55 in) |
| Free Length | 10mm – 50mm (0.39 in – 1.97 in) |
| Spring Type | Compression |
| End Type | See variant options |
| Material | See variant options |
| Surface Finish | See variant options |
| Spring Rate | See variant options |
| Packing Quantity | 10PCS or 50PCS (select above) |
Measure the bore or housing inner diameter where the spring will seat — your spring O.D. should be slightly smaller than the bore I.D. to allow free movement. For free length, select a spring that is longer than your required compressed length to ensure adequate preload and travel. Use the Wire dia × O.D. × Length variant selector above to find your exact size.
Spring rate depends on the specific O.D. and free length combination selected. With a fixed wire diameter of 0.8mm, shorter springs with smaller O.D. will have higher spring rates, while longer springs with larger O.D. will be softer. Contact us to confirm the spring rate for your specific variant if required for engineering calculations.
These springs are suitable for typical indoor mechanical environments. For outdoor, high-humidity, or submerged applications, additional corrosion protection such as stainless steel material or external coating may be required. Contact us to confirm material specifications for your specific use case.
These springs are well-suited for small appliance mechanisms, pen click assemblies, electronic device button returns, light-duty valve and plunger systems, hobby robotics, RC components, and general DIY repair projects requiring compact compression elements with O.D. between 5mm and 14mm.
The 10PCS pack is ideal for prototyping, single-unit repairs, or testing a size before committing to a larger quantity. The 50PCS pack offers a lower per-unit cost and is suited for batch production, workshop stocking, or projects requiring multiple springs of the same size. Both packs contain identical springs — only the quantity differs.
Yes. Springs in series (stacked end-to-end) reduce the effective spring rate and increase total travel. Springs in parallel (side-by-side in the same bore) increase the effective spring rate. This is a standard technique for fine-tuning spring force in mechanical assemblies when a single spring rate does not meet requirements.
Free length is the spring's natural, unloaded length — the dimension listed in the variant name (e.g., 10mm, 25mm, 50mm). Compressed length is the length under load. Always select a free length longer than your required working compressed length to ensure the spring operates within its elastic range and does not reach solid height during normal use.
