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When a mechanism fails because a tiny spring loses tension or snaps under load, the entire assembly stops working — a frustrating setback for hobbyists, engineers, and repair technicians alike. These small compression springs with a 1.0mm wire diameter are engineered for applications where compact size and consistent spring force are non-negotiable.
Each spring is formed from spring steel wire with a wire diameter of 1.0mm (0.039 in). Outer diameters span 5mm to 20mm (approx. 0.20–0.79 in), and free lengths range from 10mm to 100mm (approx. 0.39–3.94 in). Sold in packs of 5 or 10 pieces depending on the selected length variant.
Typical use cases include DIY electronics enclosures requiring button return springs, small mechanical assemblies such as pen mechanisms and latch returns, model-making and robotics projects needing compact compression elements, and repair work on consumer devices, tools, and precision instruments.
| Material | Spring Steel |
|---|---|
| Wire Diameter | 1.0mm (0.039 in) |
| Outer Diameter (OD) | 5mm – 20mm (0.20 – 0.79 in) |
| Free Length | 10mm – 100mm (0.39 – 3.94 in) |
| Spring Type | Compression |
| Coil Direction | See variant options |
| Surface Finish | See variant options |
| End Type | See variant options |
| Pack Quantity | 5 Pcs (lengths 60–100mm) / 10 Pcs (lengths 10–50mm) |
| Application | DIY mechanisms, electronics, precision instruments, model-making |
Measure the bore or housing inner diameter where the spring will sit. The spring's outer diameter (OD) should be slightly smaller than the bore to allow free movement without binding. For a shaft-guided spring, the spring's inner diameter (ID = OD minus 2× wire diameter) should be slightly larger than the shaft. With a 1.0mm wire diameter, ID = OD − 2mm.
Select a free length that is longer than your required working length. The difference between free length and working (compressed) length determines the available stroke. As a conservative rule, avoid compressing a spring beyond 80% of its free length to prevent coil bind and fatigue.
These springs are made from spring steel, which offers moderate corrosion resistance in dry indoor conditions. For outdoor, wet, or high-humidity environments, consider stainless steel springs instead. If used outdoors, applying a light coat of oil or grease can extend service life.
Spring rate depends on wire diameter, outer diameter, free length, and number of active coils. With a fixed wire diameter of 1.0mm, shorter springs with smaller OD will be stiffer, while longer springs with larger OD will be softer. Exact spring rate values are not specified; contact us to confirm if a precise rate is required for your design.
Yes. These springs are commonly used as drop-in replacements in button mechanisms, latch returns, pen clips, and small tool assemblies. Match the OD, free length, and wire diameter to the original spring for a direct replacement. The standardized coil geometry makes cross-referencing straightforward.
Pack quantity varies by the selected length variant. Springs with free lengths of 10mm to 50mm come in packs of 10 pieces. Springs with free lengths of 60mm to 100mm come in packs of 5 pieces. The quantity is shown in the variant name (e.g., "30mm & 10 Pcs").
Yes. The compact size range (OD 5–20mm, wire 1.0mm) makes these springs well-suited for small robotics joints, servo return mechanisms, model vehicle suspensions, and similar maker projects where lightweight, consistent spring force is needed in a small footprint.
