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When a loose mechanism rattles, a valve fails to seat, or a DIY assembly loses its return force, the culprit is almost always an undersized or corroded spring. These 304 stainless steel compression springs are engineered for makers, mechanics, and repair technicians who need reliable elastic force in compact spaces — without worrying about rust or fatigue failure after repeated cycling.
Each spring is wound from 1.2mm wire diameter 304 stainless steel, offering a balance of flexibility and load capacity suited to light-to-medium duty applications. Outer diameters span 8mm to 20mm (approx. 0.31" to 0.79"), and free lengths range from 10mm to 200mm (approx. 0.39" to 7.87"), giving you a wide selection matrix to match your exact dimensional requirement. Available in 1-piece and 5-piece quantities.
Typical use cases include small appliance repair (button return mechanisms, lid latches), electronics enclosures (battery contacts, PCB retention clips), automotive trim and interior panel clips, model engineering and robotics actuator return springs, and precision instrument assemblies requiring consistent spring force in a corrosion-prone environment.
| Material | 304 Stainless Steel |
|---|---|
| Wire Diameter | 1.2mm (0.047") |
| Outer Diameter (OD) | 8mm – 20mm (0.31" – 0.79") |
| Free Length | 10mm – 200mm (0.39" – 7.87") |
| Spring Type | Compression (open coil) |
| End Type | See variant options |
| Surface Finish | Natural stainless (no coating) |
| Spring Rate | See variant options |
| Max Load Capacity | See variant options |
| Quantity per Order | 1 Pcs or 5 Pcs (select above) |
Measure the bore or spring pocket your spring will sit in — the OD should be 0.5mm to 1mm smaller than the bore for a free-sliding fit. For free length, select a spring that is approximately 20–30% longer than your desired compressed height to ensure adequate preload and travel. Use the variant selector above to browse all available OD and length combinations.
A 1.2mm wire spring is suited to light-to-medium duty loads, typically in the range of a few Newtons to tens of Newtons depending on OD and free length. Shorter springs with smaller OD will have higher spring rates; longer springs with larger OD will be softer. If you need exact spring rate data for a specific variant, please contact us to confirm.
Yes. 304 stainless steel provides good resistance to atmospheric corrosion, moisture, and mild chemical exposure. It is suitable for outdoor use in most climates and for applications involving occasional water contact. For highly aggressive environments (saltwater immersion, strong acids), consider 316 stainless steel instead.
Both options ship the same spring in the same size — the only difference is quantity. The 1 Pcs option is ideal for single repairs or testing a size before committing to more. The 5 Pcs option offers a lower per-unit cost and is useful for batch builds, prototyping, or keeping spares on hand.
These springs are designed with standard coil geometry and are compatible with most off-the-shelf spring seats, retainers, and guide rods sized for the selected OD. Verify that your retainer ID is at least 0.5mm larger than the spring OD and that your guide rod OD is at least 0.5mm smaller than the spring ID to ensure smooth operation.
Yes. The smaller OD variants (8mm–12mm) and shorter lengths (10mm–30mm) are commonly used as battery contact springs, PCB retention clips, and button return mechanisms in electronics enclosures. The stainless steel material is non-magnetic (304 SS is austenitic) and will not interfere with most electronic components.
Spring rate depends on wire diameter, OD, and number of active coils (which varies with free length). If you need a specific spring rate for your design, contact us with your OD, free length, and required load — we can help you identify the closest matching variant or advise on alternatives.
