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When your mechanism demands a reliable return force in a confined space, undersized or low-grade springs fail fast — causing misalignment, premature wear, or complete mechanism failure. Engineers, hobbyists, and repair technicians who work with miniature assemblies need compression springs they can count on. These 304 stainless steel compression springs with a 0.15 mm wire diameter are engineered for exactly those demanding, small-scale applications.
Each spring is formed from 304-grade stainless steel wire with a diameter of 0.15 mm (approximately 0.006 in). Outer diameters range from 1 mm to 2 mm (approx. 0.039–0.079 in), and free lengths span 5 mm to 25 mm (approx. 0.197–0.984 in) across available variants. The coil geometry delivers consistent spring force with minimal set over repeated cycles.
Typical use cases include miniature electronics assemblies requiring contact-point preload, precision instrument mechanisms such as pen tips and valve actuators, and small-scale robotics or automation fixtures where a compact compression spring for CNC or DIY automation is needed. The corrosion-resistant finish also makes these suitable for light-duty outdoor or humid-environment applications.
Made from 304-grade stainless steel, offering solid corrosion resistance in humid or mildly corrosive environments without surface treatment.
The 0.15 mm wire diameter enables use in extremely tight bores and miniature assemblies where standard springs simply won't fit.
Available in outer diameters of 1 mm, 1.5 mm, and 2 mm, with free lengths from 5 mm to 25 mm — select the exact geometry your design requires.
Uniform coil pitch and wire cross-section deliver repeatable force characteristics across the compression stroke, reducing variability in precision assemblies.
Available from 1 pc up to 500 pcs per order — ideal for prototyping single units or stocking bulk quantities for production runs.
Suited for electronics contact preload, pen mechanisms, valve actuators, miniature robotics, and any small-scale compression spring application in DIY or professional settings.
| Material | 304 Stainless Steel |
|---|---|
| Wire Diameter | 0.15 mm (approx. 0.006 in) |
| Outer Diameter (OD) | 1 mm / 1.5 mm / 2 mm — See variant options |
| Free Length | 5 mm – 25 mm (approx. 0.197–0.984 in) — See variant options |
| Spring Type | Compression (open coil) |
| End Type | See variant options |
| Surface Finish | Natural stainless (no coating) |
| Spring Rate | See variant options |
| Pack Quantity | 1 / 10 / 20 / 40 / 50 / 80 / 100 / 120 / 150 / 200 / 300 / 500 pcs |
| Product Type | Compression Spring |
Measure the bore or housing inner diameter your spring must fit inside, then select an OD slightly smaller than that bore. For free length, choose a value that gives you the required compressed travel plus a safety margin. The available ODs are 1 mm, 1.5 mm, and 2 mm; free lengths range from 5 mm to 25 mm. Use the variant selector above to match your design requirements.
With a 0.15 mm wire diameter, these are light-duty miniature springs designed for low-force applications such as contact preload, pen tips, and small valve actuators. Exact spring rate depends on the OD and free length of the specific variant. For precise load calculations, apply the standard spring rate formula (G × d⁴) / (8 × D³ × n) using the coil geometry of your chosen variant, or contact us to confirm.
Yes. 304 stainless steel provides good resistance to oxidation and mild corrosion in humid or lightly corrosive environments. It is not recommended for prolonged exposure to chloride-rich environments (e.g., saltwater immersion) without additional protection. For such conditions, consider 316 stainless steel alternatives.
These miniature compression springs are compatible with pen and stylus mechanisms, small valve actuators, electronics PCB contact points, miniature robotics joints, precision instrument assemblies, and DIY automation fixtures. Always verify that the OD fits your bore and the free length provides adequate travel before installation.
For prototyping or one-off repairs, the 1 pc or 10 pcs options are cost-effective. For small production runs or workshop stock, 50–100 pcs offers a balance of unit cost and inventory. For high-volume production or bulk stocking, 200–500 pcs packs provide the lowest per-unit cost. Select your pack size from the variant options above.
Yes. These 304 stainless steel compression springs are suitable for light-duty automation and CNC fixture applications where a small, consistent return force is needed. Ensure the spring's load rating matches your mechanism's force requirements and that the operating temperature stays within the typical service range for 304 stainless steel (up to approximately 300°C / 572°F for static loads).
The outer diameter determines which bore size the spring fits into and influences the spring rate — a larger OD with the same wire diameter and length will generally produce a softer spring rate. Choose 1 mm OD for the tightest bores, 1.5 mm for mid-range housings, and 2 mm where slightly more lateral stability is needed. All three share the same 0.15 mm wire diameter.
