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When your project demands reliable spring force in a confined space, undersized or imprecise springs cause misalignment, premature failure, and costly rework. Engineers, hobbyists, and repair technicians working on miniature mechanisms, electronics enclosures, and precision instruments need springs they can trust to spec. These mini compression springs with a 0.35mm wire diameter are engineered for exactly those demanding, small-footprint applications.
Each spring is formed from stainless steel wire with a diameter of 0.35mm (approximately 0.014 in), with outer diameters ranging from 2mm to 8mm (approx. 0.079–0.315 in) and free lengths from 5mm to 50mm (approx. 0.197–1.969 in). The coil pitch and number of active coils vary by size; refer to variant options for exact configuration. Available in packs of 5, 10, or 50 pieces to suit both prototyping and production runs.
Typical use cases include miniature push-button mechanisms and tactile switch returns, pen and stylus clip retention assemblies, and precision instrument calibration components requiring consistent low-force spring return. These springs are also well-suited for small-scale robotics joints, medical device prototyping, and DIY electronics enclosure latches where a compact compression spring with corrosion resistance is essential.
| Material | Stainless Steel |
|---|---|
| Wire Diameter | 0.35mm (approx. 0.014 in) |
| Outer Diameter Range | 2mm – 8mm (approx. 0.079 – 0.315 in) |
| Free Length Range | 5mm – 50mm (approx. 0.197 – 1.969 in) |
| Spring Type | Compression |
| Coil Direction | See variant options |
| Spring Rate | See variant options |
| Number of Active Coils | See variant options |
| End Type | See variant options |
| Pack Quantity | 5 pcs / 10 pcs / 50 pcs (select above) |
| Surface Finish | Natural stainless (no coating) |
Measure the bore or housing inner diameter where the spring will seat — the spring outer diameter should be slightly smaller (typically 0.1–0.3mm clearance) to allow free movement. For free length, select a spring that is longer than your required compressed length to ensure adequate preload and travel. If you are unsure, order a small 5-piece or 10-piece sample pack of two or three sizes to test fit before committing to a 50-piece quantity.
With a 0.35mm wire diameter, these are light-duty miniature springs designed for low-force applications such as switch returns, pen clips, and small latches. Exact spring rate (force per unit deflection) varies by outer diameter and free length — shorter springs with smaller outer diameters will generally be stiffer. If you require a specific spring rate in N/mm or lbf/in, please contact us to confirm before ordering.
Yes. Stainless steel provides good resistance to oxidation and mild corrosion in typical indoor and light-humidity environments. These springs are suitable for applications where occasional moisture exposure is expected. For continuous immersion, salt spray, or aggressive chemical environments, please contact us to confirm suitability for your specific conditions.
These springs are designed to standard coil geometry and should fit most miniature spring seats, plunger housings, and push-button mechanisms sized for the corresponding outer diameter. Always verify the inner diameter of your housing against the spring outer diameter listed in the variant options. The inner diameter of the spring (outer diameter minus twice the wire diameter) is also relevant if the spring must seat over a pin or post.
The 10-piece pack is ideal for prototyping, repair work, or low-volume builds where you need a small quantity on hand. The 50-piece pack offers a lower per-unit cost and is suited for small production runs, stocking a workshop, or projects requiring multiple springs of the same specification. Both packs contain identical springs — only the quantity differs.
Yes, these mini compression springs are commonly used in electronics applications such as battery contact springs, tactile switch returns, and connector retention mechanisms. The stainless steel material is non-magnetic (austenitic grade) and does not introduce significant electromagnetic interference. Verify the outer diameter and free length against your PCB footprint or housing design before ordering.
Store unused springs in a dry, low-humidity environment away from direct contact with ferrous metals to prevent galvanic interaction. Keeping them in their original packaging or a sealed container is recommended. Stainless steel springs do not require oiling for corrosion protection under normal storage conditions.
