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When a project demands consistent return force in a compact form, finding the right compression spring wire diameter and outside diameter combination can be frustrating. These 304 stainless steel compression springs with a 0.7mm wire diameter are engineered for DIYers, hobbyists, engineers, and repair technicians who need dependable elastic performance across a wide range of applications.
Each spring is formed from 304-grade stainless steel wire with a wire diameter of 0.7mm (approximately 0.028 in). Outside diameters span from 4mm to 12mm (~0.16–0.47 in), and free lengths range from 5mm to 305mm (~0.20–12.0 in). Springs are available in small packs of 1–2 pieces for single-use repairs or in bulk quantities of 10–50 pieces for production and workshop use.
These compression springs suit a broad range of scenarios: replacing worn return springs in small appliances and electronics, providing cushioning in jigs and fixtures, acting as tension elements in custom mechanical assemblies, and serving as spacers or buffers in precision instruments. The stainless steel construction makes them a go-to choice for outdoor hardware, marine-adjacent environments, and food-safe equipment where corrosion resistance matters.
| Material | 304 Stainless Steel |
|---|---|
| Wire Diameter | 0.7mm (~0.028 in) |
| Outside Diameter (OD) | 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm |
| Free Length Range | 5mm – 305mm (~0.20 – 12.0 in) |
| Spring Type | Compression (open-coil) |
| End Type | See variant options |
| Surface Finish | Natural stainless (no coating) |
| Spring Rate | See variant options |
| Max Load | See variant options |
| Pack Quantity | 1, 2, 5, 10, or 50 pieces (select above) |
| Corrosion Resistance | Suitable for general outdoor and mildly corrosive environments |
| Operating Temperature | Typically –20°C to +200°C (–4°F to +392°F) |
Measure the bore (hole) or shaft your spring will work with. For a spring that fits inside a bore, the OD should be slightly smaller than the bore diameter — typically 0.2–0.5mm clearance. For a spring that fits over a shaft, the inside diameter (OD minus twice the wire diameter) should be slightly larger than the shaft. With a 0.7mm wire diameter, the inside diameter equals OD minus 1.4mm. For example, a 6mm OD spring has an ID of approximately 4.6mm.
Choose a free length that is longer than your required working length. A compression spring must be compressed from its free length to generate force. As a general rule, select a free length at least 20–30% longer than the compressed (working) height you need. For example, if you need 20mm of working height with some spring force, a 25–30mm free length spring is a reasonable starting point.
304 stainless steel offers a good balance of tensile strength, corrosion resistance, and workability for light-to-medium duty spring applications. It performs well in general DIY, electronics, appliance repair, and light mechanical assemblies. For heavy-duty industrial applications with high cyclic loads or extreme temperatures, a higher-grade spring steel or 316 stainless may be more appropriate. Contact us to confirm suitability for demanding applications.
304 stainless steel provides good resistance to atmospheric corrosion, rain, and mild humidity. It is suitable for most outdoor DIY and garden applications. However, prolonged exposure to salt spray, chlorinated water, or strong acids can cause surface staining or pitting over time. For marine or highly corrosive environments, 316 stainless steel springs are recommended.
Yes. The 0.7mm wire diameter and small OD options (4mm, 5mm) make these springs well-suited for battery contacts, button mechanisms, small switches, and other compact electronic assemblies. The stainless steel material is non-magnetic in its annealed state, which can be advantageous in sensitive electronic environments. Always verify the spring rate and dimensions match your design requirements before use.
For a single repair or prototype, the 1–2 piece options are ideal. If you are building a batch of assemblies or want workshop stock for future repairs, the 10-piece or 50-piece packs offer better value per spring. Consider ordering a small quantity first to verify fit and spring rate before committing to a larger pack.
Wire diameter (WD) is the thickness of the steel wire used to coil the spring — in this case, 0.7mm. Outside diameter (OD) is the total outer width of the coiled spring body, measured from the outermost edge of one coil to the outermost edge of the opposite coil. The inside diameter (ID) equals OD minus 2× WD. All three measurements matter when fitting a spring into a bore or over a shaft.
