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When a failed spring brings your project to a halt, finding the exact replacement fast matters. Whether you're a hobbyist repairing a mechanism, an engineer prototyping a device, or a technician maintaining equipment, these wire dia 0.5mm compression springs give you the precise fit you need without guesswork. Available in a wide range of outer diameters and free lengths, they're stocked for immediate selection.
Each spring is made from 304 stainless steel wire with a diameter of 0.5mm. Outer diameters span from 3mm to 12mm (~0.12" to ~0.47"), and free lengths range from 5mm to 305mm (~0.20" to ~12.0"). The coil ends are closed and ground for stable seating. Sold in packs of 1, 2, 5, 10, or 20 pieces depending on the variant selected.
Typical use cases include small appliance repair (pen mechanisms, clicker buttons, valve assemblies), light-duty industrial fixtures requiring a 0.5mm wire compression spring, and precision DIY builds such as custom jigs, latches, and electronic enclosures where a stainless steel pressure spring with a compact outer diameter is required.
| Material | 304 Stainless Steel |
|---|---|
| Wire Diameter | 0.5mm (~0.020") |
| Outer Diameter Range | 3mm – 12mm (~0.12" – 0.47") |
| Free Length Range | 5mm – 305mm (~0.20" – 12.0") |
| End Type | Closed and Ground |
| Spring Type | Compression (Pressure) |
| Coil Direction | See variant options |
| Surface Finish | Bright / Natural Stainless |
| Spring Rate | See variant options |
| Pack Quantity | 1 / 2 / 5 / 10 / 20 pcs (select variant) |
Measure the bore or housing your spring sits in — the outer diameter of the spring should be slightly smaller than the bore to allow free movement. For the free length, measure the available cavity depth and account for the required compressed length and travel. Use the variant selector above to match Wire Φ × Outer Φ and Length to your measurements.
A 0.5mm wire diameter spring is designed for light-duty applications. Exact load capacity depends on the outer diameter, free length, and number of active coils — all of which vary by variant. These springs are suited for pen mechanisms, small valves, electronic latches, and similar low-force applications rather than heavy industrial loads.
Yes. The springs are made from 304 stainless steel, which provides good resistance to oxidation, moisture, and mild chemical exposure. They are suitable for humid environments, light outdoor use, and applications where carbon steel springs would rust. For highly aggressive chemical environments, consult a materials specialist.
Closed ends mean the last coil is wound tightly against the adjacent coil, creating a flat bearing surface. Ground ends mean that flat surface is machined smooth. Together, these features ensure the spring sits squarely on its seat, distributes load evenly, and reduces the risk of lateral buckling — important for precision and guided applications.
304 stainless steel offers solid corrosion resistance for most outdoor and wet environments. It performs well in rain, humidity, and freshwater exposure. For saltwater or marine environments, 316 stainless steel is generally recommended. These springs are a reliable choice for most non-marine outdoor DIY and mechanical applications.
Choose the Qty(pcs) option that matches your need. Single-unit repairs typically require 1 or 2 pieces. Prototyping or small-batch builds benefit from packs of 5 or 10. If you're stocking spares or running a small production run, the 20-piece pack offers the best per-unit value. All quantities are available for most size combinations via the variant selector.
The outer diameter (OD) determines how the spring fits within a bore or around a guide rod. Smaller ODs (3mm–5mm) suit miniature mechanisms like pens and electronics. Mid-range ODs (6mm–9mm) fit light mechanical assemblies and valve bodies. Larger ODs (10mm–12mm) are used in fixtures and jigs requiring more lateral stability. All variants share the same 0.5mm wire diameter.
