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When a mechanism fails because a spring loses tension, collapses under load, or corrodes in a damp environment, the cost goes beyond the part itself. Engineers, makers, and repair technicians who need a dependable compression spring in a compact form factor will find this 1.2mm wire diameter series engineered to perform consistently across repeated cycles.
Each spring is formed from stainless steel wire with a nominal wire diameter of 1.2mm (approximately 0.047 in). Outer diameters span 8–20mm (approx. 0.31–0.79 in), and free lengths range from 10–200mm (approx. 0.39–7.87 in) across the available variants. The closed-end coil geometry provides stable seating on flat surfaces without additional fixtures.
Typical applications include compression spring replacement in electronic enclosures, valve assemblies, and jig fixtures; light-duty return mechanisms in DIY automation and robotics projects; and precision load-bearing elements in medical device prototypes and instrumentation where corrosion resistance is a baseline requirement.
Formed from stainless steel wire for resistance to oxidation and moisture, maintaining spring force in humid or mildly corrosive environments.
Consistent 1.2mm wire cross-section delivers repeatable spring rates and predictable deflection behavior across the full length range.
Outer diameters from 8mm to 20mm and free lengths from 10mm to 200mm let you select the exact geometry your application demands without custom tooling.
Closed and ground ends provide flat, stable seating surfaces that distribute load evenly and reduce lateral buckling tendency under compression.
Available in packs of 1, 5, or 10 depending on the size selected — order prototyping quantities or stock up for production runs without overpaying.
Manufactured to maintain outer diameter and free length within close tolerances, ensuring drop-in fit in existing spring pockets and guide assemblies.
| Material | Stainless Steel |
|---|---|
| Wire Diameter | 1.2mm (approx. 0.047 in) |
| Outer Diameter Range | 8–20mm (approx. 0.31–0.79 in) |
| Free Length Range | 10–200mm (approx. 0.39–7.87 in) |
| End Type | Closed ends |
| Coil Direction | See variant options |
| Spring Rate | See variant options |
| Surface Finish | Natural stainless (no coating) |
| Pack Quantity | 1 / 5 / 10 (varies by size) |
| Operating Temperature | Typically –20°C to +200°C (–4°F to +392°F) |
Measure the bore or spring pocket your spring will seat in and select an outer diameter 0.5–1mm smaller than the bore for a guided fit, or match the guide rod outer diameter to the spring inner diameter. For free length, choose a spring whose free length is at least 20–30% longer than your required compressed length to stay within the elastic range.
Spring rate depends on wire diameter, outer diameter, number of active coils, and material modulus. With a 1.2mm wire diameter, these springs are suited for light-to-medium loads — typically in the range of a few Newtons to tens of Newtons depending on the specific geometry. If you need a precise spring rate, contact us with your outer diameter and free length selection and we can provide additional data.
Stainless steel offers good resistance to atmospheric moisture and mild corrosive agents. For prolonged immersion in saltwater or exposure to strong acids or chlorides, additional protective measures or a higher-grade alloy may be warranted. For most indoor, light-outdoor, and humid-environment applications, stainless steel is a reliable choice over carbon steel alternatives.
Yes. Compression springs are designed to resist compressive force and return to their free length when the load is removed, making them inherently suitable as return springs in mechanisms such as push-button assemblies, valve actuators, and sliding components.
These springs are manufactured to consistent outer diameter tolerances and are compatible with standard guide rods and spring pockets sized to the selected outer diameter. Always verify the inner diameter (OD minus 2× wire diameter) against your guide rod diameter to confirm clearance before assembly.
Carbon steel springs offer higher tensile strength at lower cost but are susceptible to rust without surface treatment. Stainless steel springs sacrifice a small amount of maximum load capacity in exchange for inherent corrosion resistance, longer service life in humid environments, and elimination of coating degradation over time — making them the preferred choice for food-adjacent, medical, electronic, and outdoor applications.
For prototyping and fit-testing, the single-piece (×1) or 5-piece (×5) options let you validate the geometry without committing to a large quantity. Once your design is confirmed, the 10-piece (×10) packs offer a lower per-unit cost for small production runs or maintenance stock.
