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When a project demands consistent, repeatable spring force in a compact form factor, finding the right compression spring can be frustrating. Whether you are a hobbyist building custom mechanisms, a maker prototyping a device, or a technician replacing worn components, these 304 stainless steel compression springs with a 1mm wire diameter and 8mm outer diameter deliver the controlled elastic response you need across a wide range of applications.
Each compression spring is manufactured from 304 stainless steel wire with a nominal wire diameter (CS) of 1mm and an outer diameter (OD) of 8mm. Available lengths (L) range from 10mm to 305mm (approximately 0.39 in to 12.0 in), covering a broad spectrum of design requirements. The coil pitch and free-length tolerance vary by size — see variant options for exact specifications per length.
These compression springs are well suited for use in electronic enclosures requiring button return mechanisms, small mechanical assemblies such as valve actuators and latch systems, DIY robotics and automation projects needing consistent spring-back force, and laboratory or scientific instrument builds where corrosion resistance is critical.
Made from 304-grade stainless steel wire, offering solid resistance to oxidation and mild corrosion in indoor and light outdoor environments.
Available from 10mm to 305mm (≈0.39 in to 12.0 in) in a single product listing — select the exact free length your application requires.
Uniform 1mm wire diameter across all length variants ensures predictable spring rate and reliable coil geometry for repeatable performance.
Order from as few as 1 piece up to 150 pieces per variant, making it easy to source exactly what you need for prototyping or small-batch production.
The 8mm OD fits standard small-bore spring seats and guide pins, making these springs a practical drop-in choice for many common DIY and mechanical designs.
Suitable for button return mechanisms, valve springs, latch assemblies, robotics, and scientific instruments where a small, corrosion-resistant spring is required.
| Material | 304 Stainless Steel |
|---|---|
| Wire Diameter (CS) | 1mm (≈0.039 in) |
| Outer Diameter (OD) | 8mm (≈0.315 in) |
| Inner Diameter (ID) | Approximately 6mm (≈0.236 in) |
| Free Length (L) | 10mm – 305mm (≈0.39 in – 12.0 in); see variant options |
| Coil Pitch | See variant options |
| Spring Rate | See variant options |
| End Type | Closed ends (typical for this wire/OD class) |
| Surface Finish | Natural / Uncoated Stainless |
| Available Quantities | 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 12, 14, 15, 16, 18, 20, 22, 25, 26, 30, 35, 40, 45, 50, 60, 70, 80, 90, 100, 110, 120, 150 Pcs |
Measure the distance between the two surfaces the spring will sit between when the assembly is at rest (the installed length). Your free length should be longer than this installed length so the spring is under compression and exerts force. A common starting point is to choose a free length 20–40% longer than your required installed length, then verify the spring rate meets your load requirements.
With a wire diameter of 1mm and an outer diameter of 8mm, the inner diameter is approximately 6mm (OD minus 2× wire diameter). This means the spring can slide over a guide pin or shaft up to approximately 5.5–5.8mm in diameter with reasonable clearance.
304 stainless steel provides good resistance to oxidation and mild atmospheric corrosion, making these springs suitable for indoor use and light outdoor exposure. For highly corrosive environments (salt spray, chemical exposure, or prolonged immersion), consider 316 stainless steel springs instead, as 304 may show surface staining over time.
304 stainless steel retains reasonable mechanical properties up to approximately 300°C (572°F) for short-term exposure. For continuous high-temperature service above this range, a high-temperature alloy spring would be more appropriate. For typical DIY, electronics, and light mechanical applications at room temperature, these springs perform reliably.
For prototyping or single-unit builds, ordering 5–10 pieces gives you spares for testing and iteration. For small-batch production runs, quantities of 50–150 pieces offer better per-unit value. Select your size (CSxODxL) first, then choose the quantity (QTY) that matches your production needs from the variant options.
CS stands for Cross-Section wire diameter (1mm for all variants in this listing), OD stands for Outer Diameter (8mm for all variants), and L stands for the free Length of the spring. For example, "1x8x25mm" means a spring with 1mm wire diameter, 8mm outer diameter, and 25mm free length.
Springs with the same OD (8mm) and wire diameter (1mm) from different sources may have different spring rates depending on the number of active coils and material grade. While the physical dimensions will be compatible with the same spring seat, the force output may differ. Always verify the spring rate and free length match your design specification when substituting springs.
