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When a worn-out or undersized spring causes your mechanism to fail mid-cycle, finding an exact replacement fast is critical. Whether you are a hobbyist repairing a pen mechanism, a technician servicing industrial equipment, or a maker building a custom actuator, these compression springs give you the dimensional precision and material consistency you need to get back on track.
Each spring is formed from spring steel wire, offering a reliable balance of tensile strength and elastic recovery. Wire diameters range from 0.3 mm to 6 mm (approximately 0.012 in to 0.236 in), outer diameters from 3 mm to 50 mm (approximately 0.12 in to 1.97 in), and free lengths from 105 mm to 400 mm (approximately 4.1 in to 15.7 in). Springs are available individually (1 PCS) or in value packs (5 PCS).
Typical applications include compression spring replacements for pens, clickers, and small consumer goods; return springs for mechanical switches, valves, and actuators; and load-bearing springs for DIY jigs, fixtures, and prototype assemblies requiring consistent spring force across repeated cycles.
Wide Size Range — Wire diameter 0.3–6 mm and OD 3–50 mm cover the majority of small-to-medium spring applications in one product listing.
Spring Steel Construction — Formed from spring steel wire for consistent elastic modulus, reliable return force, and resistance to permanent set under repeated compression cycles.
Precise Dimensional Tolerances — Consistent wire diameter and coil pitch ensure predictable spring rate and straightforward drop-in replacement for worn components.
Closed & Ground Ends (typical) — End configuration provides a flat seating surface for stable load transfer in spring seats, plungers, and actuator housings.
Single or 5-Pack Options — Order 1 PCS for a targeted repair or 5 PCS for prototyping, spares inventory, or multi-unit builds at a lower per-unit cost.
Broad Application Compatibility — Suitable for consumer electronics, mechanical assemblies, DIY projects, industrial tooling, and educational robotics builds.
| Material | Spring Steel |
|---|---|
| Wire Diameter Range | 0.3 mm – 6 mm (0.012 in – 0.236 in) |
| Outer Diameter Range | 3 mm – 50 mm (0.12 in – 1.97 in) |
| Free Length Range | 105 mm – 400 mm (4.1 in – 15.7 in) |
| Spring Type | Compression / Return Spring |
| End Type | See variant options |
| Surface Finish | See variant options |
| Spring Rate | See variant options |
| Quantity per Order | 1 PCS or 5 PCS (select via Length & QTY option) |
| Coil Direction | See variant options |
Start by measuring the bore or housing your spring sits in — the outer diameter of the spring should be slightly smaller than the bore to allow free movement. Then select a wire diameter that provides the spring rate (stiffness) you need: thicker wire produces a stiffer spring. If you are replacing an existing spring, measure the original wire diameter and OD directly with calipers before ordering.
Spring rate depends on the specific combination of wire diameter, outer diameter, free length, and number of active coils. Because this listing covers a wide range of sizes, the spring rate varies by variant. If you need a specific spring rate value, please contact us with your selected wire diameter, OD, and free length and we will provide guidance.
These springs are made from spring steel, which offers good mechanical properties but has moderate corrosion resistance. For outdoor, humid, or chemically exposed environments, consider applying a light coat of oil or grease after installation, or contact us to inquire about alternative material options such as stainless steel springs.
Spring steel maintains its mechanical properties well at room temperature and moderate elevated temperatures (typically up to around 120–150°C / 250–300°F). For applications involving sustained high heat, please contact us to confirm suitability before ordering.
Both options ship the same spring in the same size. The 5 PCS pack provides five identical springs at a lower per-unit cost, making it ideal for prototyping, building multiple units, or keeping spares on hand. Select your preferred quantity via the Length & QTY(Pcs) option above.
Measure the uncompressed length of your existing spring, or calculate the required free length based on your mechanism's travel distance plus the compressed length. The free length options available in this listing range from 105 mm to 400 mm. If you need a length not listed, contact us to discuss availability.
Yes. The smaller wire diameter variants (0.3 mm – 0.8 mm) with outer diameters of 3 mm – 8 mm are well suited for pen mechanisms, push-button clickers, small latches, and similar consumer product applications. Select the wire diameter and OD that match your original component.
