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When a mechanism fails because a worn-out spring can no longer hold its load, finding an exact replacement fast is critical. Whether you are a hobbyist repairing a tool, a technician servicing equipment, or a maker prototyping a new device, these compression springs give you the precise size you need without ordering a custom batch. Available in wire diameters from 0.4 mm to 2 mm and outer diameters from 3 mm to 25 mm, all at a fixed free length of 10 mm (0.39 in).
Each spring is wound from round wire and offered in three material grades: 304 stainless steel for corrosion resistance, spring steel for high elasticity and fatigue life, and zinc-plated carbon steel for general-purpose indoor use. Wire diameters span 0.4 mm–2 mm (0.016–0.079 in) and outer diameters span 3 mm–25 mm (0.12–0.98 in), with a consistent free length of 10 mm (0.39 in). Packs are available in 4, 5, or 10 pieces depending on the variant selected.
Typical applications include small compression spring replacement in pens and clickers, spring-loaded latch mechanisms and push-button assemblies, DIY electronics enclosures requiring contact pressure, RC model and hobby robotics builds needing compact return springs, and precision instrument repair where a standard spring size is required.
Outer diameters from 3 mm to 25 mm (0.12–0.98 in) and wire diameters from 0.4 mm to 2 mm — one listing covers dozens of replacement scenarios.
Choose 304 stainless steel for moisture-prone environments, spring steel for maximum elasticity, or zinc-plated steel for cost-effective indoor use.
All variants share a 10 mm (0.39 in) free length, making it straightforward to swap springs across similar assemblies without re-engineering the housing.
304 stainless steel variants resist rust and oxidation, suitable for humid workshops, outdoor enclosures, and marine-adjacent hobby builds.
Available in packs of 4, 5, or 10 pieces depending on the variant — order exactly what you need for a repair or keep spares on hand for future projects.
Suited for pens, latches, push-buttons, RC models, robotics, precision instruments, and general mechanical assemblies requiring a compact return or pressure spring.
| Spring Type | Compression (coil) |
|---|---|
| Free Length | 10 mm (0.39 in) |
| Outer Diameter Range | 3 mm – 25 mm (0.12 – 0.98 in) |
| Wire Diameter Range | 0.4 mm – 2 mm (0.016 – 0.079 in) |
| Material Options | 304 Stainless Steel / Spring Steel / Zinc-Plated Carbon Steel |
| Surface Finish | Natural (stainless & spring steel) / Zinc plating (carbon steel) |
| End Type | Closed & ground (typical for this size range) |
| Spring Rate | See variant options |
| Max Load | See variant options |
| Pack Quantity | 4 pcs / 5 pcs / 10 pcs (see variant options) |
| Coil Direction | Right-hand wound |
| Operating Temperature | Stainless: up to ~300°C; Spring steel: up to ~120°C; Zinc: up to ~100°C |
Measure the inner diameter of the housing or bore the spring will sit in. The spring's outer diameter should be slightly smaller than the bore — typically 0.1 mm to 0.5 mm clearance — so it can compress freely without binding. If the spring sits over a rod, the inner diameter of the spring (outer diameter minus twice the wire diameter) must be larger than the rod's outer diameter.
304 stainless steel offers good corrosion resistance and is suitable for humid, wet, or mildly corrosive environments. Spring steel (typically 65Mn or similar) provides higher tensile strength and better fatigue life under repeated cycling, making it the preferred choice for high-cycle mechanical applications in dry conditions. If corrosion resistance is not a concern and you need maximum spring performance, spring steel is the stronger option.
The 304 stainless steel variants offer solid resistance to rust and oxidation and are suitable for outdoor hobby builds, enclosures exposed to humidity, and marine-adjacent environments. Spring steel variants are not recommended for prolonged outdoor exposure without additional protection. Zinc-plated variants provide basic corrosion protection for indoor use only.
Yes. The 10 mm free length and compact outer diameters (as small as 3 mm) make these springs well-suited for push-button assemblies, spring-loaded latches, pen mechanisms, and similar low-travel applications. Select a wire diameter that provides the return force your mechanism requires — lighter wire diameters (0.4–0.6 mm) give softer feel; heavier wire diameters (1.2–2 mm) give firmer resistance.
Wire diameter directly affects spring stiffness (spring rate). Thinner wire (e.g., 0.4–0.6 mm) produces a softer spring with lower load capacity, suitable for light-duty applications like pens or small electronics. Thicker wire (e.g., 1.2–2 mm) produces a stiffer spring capable of handling higher loads, suitable for latches, tools, and mechanical assemblies. If you know the required spring rate or load, use a spring rate calculator with the outer diameter, wire diameter, and free length to verify before ordering.
Pack quantity varies by variant: most stainless steel and spring steel variants come in packs of 10 pieces; some larger-diameter stainless steel variants are sold in packs of 5 pieces; and 2 mm wire diameter variants are sold in packs of 4 pieces. The pack quantity is shown in the "Material Selection & Qty" option when you select your variant above.
Yes. The compact 10 mm free length and range of outer diameters (3–25 mm) make these springs a practical choice for RC suspension systems, servo return mechanisms, gripper assemblies, and other hobby robotics applications where a small, reliable compression spring is needed. Spring steel variants are recommended for high-cycle robotic applications due to their superior fatigue resistance.
