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When a failed micro spring brings a precision instrument, electronic assembly, or delicate mechanical device to a halt, finding an exact replacement fast is critical. Engineers, repair technicians, and serious DIYers who work with compact mechanisms need miniature compression springs that hold consistent load ratings across repeated cycles — without corroding or fatiguing prematurely. These 10Pcs A2 stainless steel miniature compression springs are designed for exactly those demanding, small-scale applications.
Each pack contains 10 identical springs manufactured from A2 (304) stainless steel wire with a diameter of 0.2mm. Outer diameters range from 1mm to 4mm (approx. 0.039" to 0.157") and free lengths span 5mm to 25mm (approx. 0.197" to 0.984"), selectable by variant. The close-wound coil geometry provides a smooth, linear compression response suited to light-load precision work.
Typical use cases include replacement springs for mechanical pencils and retractable pens, contact-pressure elements in PCB test fixtures and battery compartments, return springs in miniature valves and solenoids, and tensioning components in watchmaking or fine instrument repair. The corrosion-resistant A2 alloy also makes these springs a reliable choice for humid or mildly corrosive environments where carbon steel would degrade.
| Material | A2 Stainless Steel (304 grade) |
|---|---|
| Wire Diameter | 0.2mm (0.008") |
| Outer Diameter (OD) | 1mm – 4mm (0.039" – 0.157") — See variant options |
| Free Length | 5mm – 25mm (0.197" – 0.984") — See variant options |
| Coil Type | Close-wound compression |
| End Type | Open ends (unground) |
| Quantity per Pack | 10 pieces |
| Load Rating | See variant options |
| Surface Finish | Natural (uncoated stainless) |
| Operating Temperature | Typically –20°C to +200°C (–4°F to +392°F) |
Measure the bore or housing your spring sits in and select an outer diameter (OD) slightly smaller than that bore — typically 0.1mm to 0.3mm clearance. For free length, choose a spring that is longer than your required compressed length so it still exerts force at full compression. Use the variant selector above to pick your exact OD and length combination.
With a 0.2mm wire diameter, these springs are designed for very light loads — typically in the range of a few grams to a few hundred grams of force depending on the outer diameter and free length selected. They are suited for contact-pressure, return-force, and tensioning roles in precision instruments rather than heavy-duty mechanical applications.
Yes. A2 (304) stainless steel provides good resistance to oxidation, moisture, and mild chemical exposure. These springs are suitable for indoor humid environments, light outdoor use, and applications where carbon steel would rust. For highly aggressive chemical or saltwater environments, A4 (316) stainless steel would be a more appropriate choice.
These springs follow standard coil geometry and are compatible with most miniature spring housings, plunger bores, and guide pins sized to match the selected OD. Always verify the inner diameter (ID = OD minus 2× wire diameter, so approximately OD – 0.4mm) clears your guide pin with adequate tolerance before ordering.
Yes. The small wire diameter and fine OD range make these springs well-suited for PCB test probes, battery contact springs, and SMT-adjacent assemblies. A2 stainless steel is non-magnetic and does not introduce significant interference in low-current signal paths, making it a practical choice for electronic applications.
A larger outer diameter at the same wire diameter and length will generally produce a stiffer spring with a higher spring rate. If you need more force over the same travel distance, select a larger OD. If you need a softer, more compliant spring for delicate contact applications, choose a smaller OD. Refer to your application's load requirements and housing clearance to make the final selection.
These springs have open (unground) ends, meaning the coil pitch continues to the very tip without a flat ground surface. Open-end springs are standard for most light-duty and miniature applications. Closed and ground ends provide a flat seating surface for more precise load distribution, which is typically required in heavier industrial springs. For the precision instrument and electronics use cases these springs target, open ends are the conventional and appropriate choice.
🛒 Select your Wire Diameter, Outer Diameter, and Length above, then add to cart.
