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When a project stalls because the right compression spring is nowhere to be found, hobbyists and engineers alike lose time and momentum. These 30mm compression springs are engineered for makers, repair technicians, and small-scale mechanical designers who need reliable elastic return force in a compact form factor — without ordering in bulk or waiting weeks for custom parts.
Each spring is 30mm (≈1.18 in) in free length, with outer diameters ranging from 1.5mm to 22mm (≈0.06–0.87 in) and wire diameters from 0.2mm to 1.4mm (≈0.008–0.055 in). Available in 304 stainless steel, spring steel (65Mn), and zinc-plated carbon steel, sold in packs of 5 or 10 pieces depending on the variant selected.
Typical use cases include compression spring replacement in pen mechanisms and clicker buttons, small appliance repair requiring a 30mm return spring, prototype builds needing a miniature coil spring with precise wire diameter, and RC model or hobby robotics assemblies where a compact pressure spring keeps components seated under load.
Outer diameters from 1.5mm to 22mm and wire diameters from 0.2mm to 1.4mm cover the majority of small-to-medium compression spring applications in one listing.
Choose 304 stainless steel for corrosion resistance, 65Mn spring steel for higher fatigue strength, or zinc-plated carbon steel for a cost-effective general-purpose option.
All variants share a 30mm (≈1.18 in) free length, making it straightforward to compare and swap springs across different diameter options without recalculating travel.
Stainless steel variants resist rust in humid or mildly wet environments; zinc-plated variants provide a protective barrier against oxidation for indoor mechanical use.
Stainless steel and spring steel variants ship in 10-piece packs; zinc-plated variants come in 5-piece packs — ideal for prototyping, repair stock, or small production runs.
Uniform pitch and closed ends ensure even load distribution and stable seating in bores, reducing lateral deflection during compression cycles.
| Free Length | 30 mm (≈1.18 in) |
|---|---|
| Outer Diameter | 1.5 mm – 22 mm (≈0.06 – 0.87 in) — See variant options |
| Wire Diameter | 0.2 mm – 1.4 mm (≈0.008 – 0.055 in) — See variant options |
| Material | 304 Stainless Steel / 65Mn Spring Steel / Zinc-Plated Carbon Steel — See variant options |
| Surface Finish | Natural (stainless & spring steel) / Zinc-plated (carbon steel) |
| End Type | Closed ends (typical for this size range) |
| Spring Type | Compression (helical coil) |
| Pack Quantity | 10 pcs (stainless & spring steel) / 5 pcs (zinc-plated) — See variant options |
| Load Capacity | See variant options (varies by wire diameter and outer diameter) |
| Operating Temperature | Stainless: up to approx. 300°C; Spring steel: up to approx. 120°C; Zinc-plated: up to approx. 100°C |
Measure the bore or housing your spring will sit in — the outer diameter of the spring should be slightly smaller than the bore for a sliding fit, or slightly larger if you need it to grip the outside of a shaft. Wire diameter determines stiffness (spring rate): thicker wire = stiffer spring. If you need a softer return force, choose a smaller wire diameter; for a firmer push, go with a larger wire diameter. Use the variant selector above to match both dimensions to your design.
304 stainless steel offers good corrosion resistance and is suitable for humid or mildly wet environments. 65Mn spring steel provides higher tensile strength and fatigue life, making it better for high-cycle applications, but it is more susceptible to rust if exposed to moisture. Zinc-plated carbon steel is a cost-effective general-purpose option with a protective coating for indoor use. Choose stainless for longevity in damp conditions, spring steel for demanding mechanical cycles, and zinc-plated for budget-conscious indoor projects.
Yes — all dimensions are metric. Outer diameters range from 1.5mm to 22mm, covering common metric bore sizes used in hobby, electronics, and light mechanical assemblies. Always verify the specific outer diameter and wire diameter of the variant you select against your design drawings before ordering.
Stainless steel variants (304 grade) are suitable for light outdoor or humid indoor use. Spring steel and zinc-plated variants are better suited for dry indoor environments. For prolonged outdoor exposure or contact with water, stainless steel is the recommended choice. None of these variants are rated for saltwater immersion or highly corrosive chemical environments.
Stainless steel and spring steel variants come in packs of 10 pieces. Zinc-plated variants come in packs of 5 pieces. The pack quantity is shown in the "Material Selection & Qty" option when you select your variant above.
Spring rate varies by wire diameter and outer diameter combination. As a general guide: thinner wire diameters (0.2–0.4mm) produce softer springs with lower load capacity, while thicker wire diameters (0.8–1.4mm) produce stiffer springs capable of handling greater compressive loads. Exact spring rate values depend on the specific variant; if you require a precise spring rate for an engineering application, please contact us with your load and deflection requirements so we can confirm compatibility.
Yes — the smaller diameter variants (1.5mm–6mm outer diameter, 0.2mm–0.5mm wire diameter) are well-suited for pen mechanisms, push-button clickers, keyboard switches, and small electronic assemblies. The 30mm free length fits many standard pen and clicker housings. Select the outer diameter that matches your housing bore for a proper fit.
