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When a mechanism fails because a tiny spring loses its tension, the whole project stalls. Engineers, hobbyists, and repair technicians who need a reliable compression spring in a compact 10mm free length will find this listing covers the widest practical range of wire diameters and outer diameters available in one place.
Each spring in this listing has a free length of 10mm (0.39 in). Wire diameters span 0.2mm to 1.5mm (0.008–0.059 in) and outer diameters range from 1.5mm to 25mm (0.06–0.98 in). Three material options are offered: 304 stainless steel for corrosion resistance, spring steel for high elasticity and fatigue life, and zinc-plated carbon steel for general-purpose indoor use.
Typical applications include electronic device buttons and tactile switches, small appliance mechanisms and pen clickers, RC model suspension and throttle return systems, and precision instrument calibration assemblies requiring a consistent compression spring with a 10mm free length.
Consistent 10mm (0.39 in) free length across all variants for predictable stack height in your assembly.
Wire diameters from 0.2mm to 1.5mm paired with outer diameters from 1.5mm to 25mm — one listing covers dozens of precise combinations.
304 stainless steel resists oxidation; spring steel maximises elastic range; zinc-plated carbon steel suits dry indoor environments.
Ends are closed and typically ground flat for stable seating and square load application — reduces lateral deflection under compression.
Available in 5-piece or 10-piece packs depending on variant, so you can stock spares without over-ordering.
Manufactured to tight tolerances so each compression spring in a batch delivers repeatable force-deflection behaviour for prototyping and production alike.
| Free Length | 10 mm (0.39 in) |
|---|---|
| Wire Diameter Range | 0.2 mm – 1.5 mm (0.008 – 0.059 in) |
| Outer Diameter Range | 1.5 mm – 25 mm (0.06 – 0.98 in) |
| Material Options | 304 Stainless Steel / Spring Steel / Zinc-Plated Carbon Steel |
| End Type | Closed, typically ground flat |
| Coil Direction | Right-hand |
| Spring Rate | See variant options |
| Max Load | See variant options |
| Pack Quantity | 5 pcs or 10 pcs (see variant) |
| Surface Finish | Natural (stainless / spring steel) or Zinc-plated (carbon steel) |
| Operating Temperature | Stainless: –200 °C to +300 °C; Spring steel: –40 °C to +120 °C |
Measure the bore or housing your spring sits in and subtract 0.2–0.5mm for clearance to get your maximum outer diameter. Then select a wire diameter that gives you the spring rate (stiffness) you need — thicker wire produces a stiffer spring. If you are unsure, start with a mid-range wire diameter such as 0.5mm or 0.8mm and test deflection under your expected load.
304 stainless steel offers good corrosion resistance and is suitable for humid or mildly corrosive environments. Spring steel (typically 65Mn or similar) has a higher elastic limit and fatigue life, making it better for high-cycle applications where the spring is compressed and released repeatedly. For outdoor or wet environments, choose stainless steel. For high-frequency mechanical cycling, spring steel is often preferred.
The 304 stainless steel variants offer good resistance to rust and mild chemical exposure. The zinc-plated carbon steel variants provide basic corrosion protection suitable for dry indoor use. Spring steel variants without plating are best used in dry environments or where they will be lubricated. For marine or highly corrosive environments, stainless steel is the recommended choice.
Yes, provided you select the correct outer diameter. The outer diameter listed in the variant name is the nominal free-state OD. Allow 0.2–0.5mm clearance between the spring OD and the bore ID for smooth operation. The inner diameter (ID) is approximately equal to the outer diameter minus twice the wire diameter, which determines the minimum shaft or guide pin diameter the spring can slide over.
Yes. The smaller wire diameter variants (0.2mm–0.5mm) with outer diameters of 1.5mm–6mm are commonly used in tactile switches, button mechanisms, battery contacts, and pen clickers. Stainless steel is preferred for electronics due to its non-magnetic properties and resistance to oxidation, which helps maintain consistent electrical contact where the spring also serves as a conductor.
Pack quantity depends on the variant selected. Most stainless steel and spring steel variants are sold in 10-piece packs. Some smaller or larger diameter combinations are available in 5-piece packs (labelled "5 pcs" in the variant name). The quantity is clearly shown in the "Material Selection & Qty" option before you add to cart.
Spring rate (N/mm) depends on the wire diameter, outer diameter, number of active coils, and material modulus. For a 10mm free-length spring, the number of active coils is relatively low, which generally results in a stiffer spring compared to longer springs of the same wire and OD. If you need a specific spring rate, contact us with your load and deflection requirements and we can advise on the best variant.
