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When a worn-out or undersized spring causes equipment to fail mid-task, finding an exact replacement fast is critical. Whether you are a mechanical engineer, a workshop technician, or a hands-on DIYer, these 304 stainless steel compression springs give you a reliable, corrosion-resistant solution in a wide range of sizes — all in a convenient 10-piece pack.
Each spring is formed from 2.0 mm wire diameter 304 stainless steel, offering a good balance of tensile strength and flexibility. Outer diameters span 10 mm to 35 mm (approx. 0.39 in to 1.38 in), and free lengths range from 15 mm to 50 mm (approx. 0.59 in to 1.97 in), covering a broad spectrum of standard mechanical fits. The closed-end coil design ensures stable seating on flat surfaces.
Typical use cases include valve and actuator assemblies requiring consistent return force, jig and fixture clamping mechanisms in woodworking or metalworking shops, and automotive or appliance repair where a direct-fit compression spring replacement is needed quickly.
| Material | 304 Stainless Steel |
|---|---|
| Wire Diameter | 2.0 mm (0.079 in) |
| Outer Diameter (OD) | 10 mm – 35 mm (0.39 in – 1.38 in) — See variant options |
| Free Length | 15 mm – 50 mm (0.59 in – 1.97 in) — See variant options |
| End Type | Closed ends |
| Coil Direction | Right-hand wound (typical) |
| Finish | Natural stainless (uncoated) |
| Quantity per Pack | 10 pieces |
| Spring Rate | See variant options |
| Max Load Capacity | See variant options |
Measure the bore or housing that the spring will sit inside. The spring's outer diameter should be slightly smaller than the bore to allow free movement without binding. For a spring that fits over a rod, the inner diameter (OD minus twice the wire diameter) must be larger than the rod's outer diameter. Use the variant selector above to pick the OD that matches your measured clearance.
The free length is the uncompressed length of the spring. Choose a free length that, when compressed to your working height, still provides the required load without exceeding the spring's solid height. As a general guide, avoid compressing a spring beyond 80% of its free length in continuous-duty applications to prevent set (permanent deformation).
304 stainless steel offers good resistance to atmospheric corrosion and mild moisture exposure. It performs well in indoor mechanical assemblies and light outdoor use. For highly corrosive environments — such as saltwater, strong acids, or chlorine-rich atmospheres — consider 316 stainless steel instead. For typical workshop, automotive, or household applications, 304 is a reliable choice.
304 stainless steel retains reasonable mechanical properties up to approximately 300–400°C (570–750°F) for short-term exposure. For continuous high-temperature service above this range, a high-temperature alloy spring would be more appropriate. For most room-temperature and moderate-heat applications — such as automotive engine bays or appliance interiors — these springs are suitable.
Yes. Each pack contains 10 springs of the same wire diameter, outer diameter, and free length as specified by the variant you select. This makes them ideal for batch replacements, symmetric assemblies, or keeping matched spares in your toolbox.
Spring rate depends on wire diameter, outer diameter, number of active coils, and material modulus. Because the number of active coils varies by free length variant, the exact spring rate differs per size. If you need a specific load at a defined deflection, please contact us with your requirements and we can help identify the closest matching variant or advise on suitability.
Closed-end springs have the last coil ground or tightly wound flat against the adjacent coil, creating a stable, flat bearing surface. This reduces lateral buckling and ensures even load transfer to the spring seat. Open-end springs have the end coil at the same pitch as the body coils, which can cause slight instability under load. These springs use a closed-end design for more consistent performance in precision assemblies.
