Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.
When your mechanism demands a reliable return force in a confined space, an undersized or wrong-grade spring can cause premature failure, inconsistent actuation, or corrosion that contaminates sensitive assemblies. Engineers, hobbyists, and repair technicians working on precision instruments, electronics, medical devices, and small mechanical assemblies need miniature compression springs they can trust to spec — every time.
This listing includes 10 pieces of A2 stainless steel compression springs with a wire diameter of 0.3mm (approx. 0.012 in). Outer diameter options range from 1.6mm to 7mm (approx. 0.063–0.276 in), and free length options span 5mm to 35mm (approx. 0.197–1.378 in). The A2 (304-grade equivalent) stainless steel construction delivers solid corrosion resistance suitable for indoor, humid, and mildly corrosive environments.
Typical use cases include miniature compression springs for pen mechanisms and click buttons, small compression springs for electronic switch assemblies and PCB contacts, and precision return springs for medical device components and laboratory instruments requiring consistent spring force in tight tolerances.
| Material | A2 Stainless Steel (304-equivalent) |
|---|---|
| Wire Diameter | 0.3mm (approx. 0.012 in) |
| Outer Diameter | See variant options (1.6mm – 7mm) |
| Free Length | See variant options (5mm – 35mm) |
| Spring Type | Compression |
| End Type | See variant options |
| Surface Finish | Natural / Uncoated |
| Quantity per Pack | 10 Pieces |
| Corrosion Resistance | Suitable for humid and mildly corrosive environments |
| Application | Precision instruments, electronics, medical devices, mechanical assemblies |
Measure the inner diameter of the bore or housing where the spring will sit. The spring's outer diameter should be slightly smaller than the bore ID to allow free compression without binding. For a shaft-guided spring, the inner diameter of the spring (outer diameter minus twice the wire diameter) should be slightly larger than the shaft OD. Use the variant selector to choose the outer diameter that fits your housing.
Free length is the uncompressed length of the spring. Select a free length that, when compressed to your working length, still provides the required force without exceeding the solid height (fully compressed length). As a conservative rule, avoid compressing the spring beyond 80% of its free length in continuous-duty applications to prevent set.
A2 stainless steel (304-equivalent) offers a good balance of tensile strength and corrosion resistance for most light-to-medium duty miniature spring applications. It is well-suited for indoor, humid, and mildly corrosive environments. For highly aggressive chemical environments or elevated temperatures above approximately 300°C, consider A4 (316) or high-temperature alloy springs instead.
A2 stainless steel provides solid resistance to oxidation, moisture, and mild chemical exposure. These springs will not rust under normal indoor or humid conditions. They are not recommended for prolonged immersion in saltwater or strong acids without additional protective measures. For marine or highly corrosive environments, A4 stainless steel springs are a better choice.
These springs are general-purpose miniature compression springs. Compatibility depends on your housing bore diameter, shaft diameter (if shaft-guided), required free length, and spring rate. Please verify the outer diameter, inner diameter (OD minus 2× wire diameter = 0.6mm), and free length against your assembly drawings before ordering. If you need a specific spring rate value, contact us to confirm.
Yes. The small wire diameter (0.3mm) and fine outer diameter options (starting at 1.6mm) make these springs well-suited for PCB contact springs, switch return mechanisms, and connector assemblies. A2 stainless steel is non-magnetic in its annealed state, which is beneficial in sensitive electronic environments. Always verify the spring's electrical conductivity requirements for your specific circuit design.
Miniature springs are easy to lose during assembly and prototyping. A 10-piece pack gives you spares for rework, testing, and batch production without the cost of ordering individually each time. It also ensures all springs in your assembly come from the same production batch, minimizing variation in spring rate and dimensions.
