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When a repair stalls because a tiny spring has lost its tension — or a prototype needs a reliable return force in a confined space — finding the right small compression spring matters. These 0.3mm wire diameter stainless steel coil springs are designed for engineers, hobbyists, and repair technicians who need consistent, corrosion-resistant performance in compact mechanisms.
Each spring is wound from stainless steel wire with a diameter of 0.3mm (approx. 0.012 in), with outside diameters ranging from 2mm to 7mm (approx. 0.08–0.28 in) and free lengths from 5mm to 305mm (approx. 0.2–12 in). Sold in packs of 1 to 40 pieces depending on the selected variant.
Typical use cases include small appliance repair requiring miniature compression springs, precision instrument assembly needing stainless steel coil springs, and electronics or PCB fixture work where corrosion-resistant small springs are essential.
| Wire Diameter | 0.3mm (approx. 0.012 in) |
|---|---|
| Outside Diameter (OD) | 2mm / 3mm / 4mm / 5mm / 6mm / 7mm — See variant options |
| Free Length | 5mm – 305mm — See variant options |
| Material | Stainless Steel |
| Spring Type | Compression Spring (Coil Spring) |
| End Type | See variant options |
| Spring Rate | See variant options |
| Surface Finish | Natural stainless steel (no coating) |
| Pack Quantity | 1 / 3 / 5 / 6 / 10 / 20 / 40 Pcs — See variant options |
Measure the bore or housing your spring will sit in and select an OD slightly smaller than that bore. For free length, choose a spring that is longer than your required compressed length to ensure adequate travel. This product offers OD options from 2mm to 7mm and lengths from 5mm to 305mm — use the variant selector above to find your combination.
Spring rate depends on wire diameter, OD, free length, and number of active coils. Because this listing covers multiple length and OD combinations, the spring rate varies by variant. If you need a specific spring rate for a load-critical application, please contact us with your requirements to confirm.
Yes. These springs are made from stainless steel, which provides good resistance to oxidation and mild corrosion. They are suitable for indoor environments with humidity exposure, light outdoor use, and applications where carbon steel springs would rust. For highly aggressive chemical environments, please contact us to confirm suitability.
These 0.3mm wire dia stainless steel coil springs are commonly used in small appliance repair, electronics fixtures, model engineering, precision instruments, pen mechanisms, medical device prototyping, and DIY mechanical assemblies. The 2–7mm OD range makes them suitable for tight-clearance bores.
Pack quantities range from 1 piece (for single-unit repair) up to 40 pieces (for batch production or stocking). Select your preferred quantity in the "Length & Packaging Quantity" variant option. Larger packs offer a lower per-unit cost.
Stainless steel provides meaningful corrosion resistance compared to plain carbon steel, making these springs usable in damp or occasionally wet conditions. For continuous outdoor immersion or salt-spray environments, we recommend confirming the specific stainless steel grade with us before ordering.
All variants share the same 0.3mm wire diameter. The outside diameter determines how the spring fits within a bore or around a guide pin. A larger OD with the same wire diameter will generally have a lower spring rate and higher load capacity at a given deflection. Choose based on your housing dimensions and required force.
