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When a repair stalls because you can't find a spring that fits, the frustration is real. Hobbyists, makers, and repair technicians who work with compact mechanisms — pens, small valves, electronic enclosures, or precision instruments — need compression springs that are dimensionally consistent and reliably elastic. These small compression springs are engineered for exactly those tight-tolerance applications where a mismatched spring causes premature failure or inconsistent force.
Each spring is wound from carbon steel wire with a diameter of 0.6mm or 0.7mm, with outer diameters (OD) ranging from 5mm to 12mm (approximately 0.20–0.47 in) and free lengths from 60mm to 100mm (approximately 2.36–3.94 in). The helical coil geometry provides consistent spring-back force across the full compression range. Variants are available in pack quantities of 5, 10, 25, or 50 pieces.
Typical use cases include replacement springs for ballpoint pens and mechanical pencils, return springs in small solenoid valves and push-button switches, and preload springs in precision instrument assemblies. Long-tail applications include DIY compression spring replacement for small appliances, miniature spring for electronics enclosure latch, and steel coil spring for hobby robotics actuator.
| Spring Type | Helical Compression Spring |
|---|---|
| Wire Diameter | 0.6mm or 0.7mm (see variant options) |
| Outer Diameter (OD) | 5mm – 12mm (see variant options) |
| Free Length | 60mm – 100mm (see variant options) |
| Material | Carbon Steel |
| End Type | Closed ends (typical for this size range) |
| Surface Finish | See variant options |
| Spring Rate | See variant options |
| Pack Quantity | 5 / 10 / 25 / 50 pcs (see variant options) |
| Unit Weight | See variant options |
Match three dimensions to your application: wire diameter (0.6mm or 0.7mm), outer diameter (OD, 5–12mm), and free length (60–100mm). If replacing an existing spring, measure the wire thickness with calipers, the coil OD, and the uncompressed length. Select the variant that matches all three. If the spring seats inside a bore, the OD should be slightly smaller than the bore; if it seats over a shaft, the inner diameter (OD minus 2× wire dia.) should be slightly larger than the shaft.
Spring rate varies by wire diameter, OD, free length, and number of active coils. Because this listing covers a wide size matrix, specific spring rate values are not listed here. For engineering-critical applications, contact us with your exact size and we can provide additional technical data. For most repair and hobby uses, the spring rate of a correctly sized replacement will be functionally equivalent to the original.
These springs are made from carbon steel, which provides good mechanical properties but has limited corrosion resistance in wet or high-humidity environments. For dry indoor applications — electronics, instruments, pens, and similar — carbon steel is appropriate. If your application involves moisture, consider applying a light oil or protective coating after installation. For inherently corrosion-resistant options, contact us about stainless steel alternatives.
These springs are well-suited for compact mechanisms requiring a low-force return or preload element: ballpoint pens, mechanical pencils, push-button switches, small solenoid valves, electronic enclosure latches, hobby robotics actuators, precision instrument assemblies, and DIY repair projects. The 60–100mm free length range makes them particularly useful where a longer travel is needed in a small-diameter package.
Carbon steel springs are not recommended for prolonged outdoor exposure without protective coating due to oxidation risk. For high-temperature environments (above approximately 120°C / 250°F), the spring rate and fatigue life may be affected. If your application involves elevated temperatures or outdoor exposure, contact us to discuss material alternatives such as stainless steel or alloy steel springs.
Wire diameter directly affects spring stiffness and load capacity. A 0.7mm wire produces a stiffer spring with higher load capacity compared to a 0.6mm wire of the same OD and length. If you are replacing an existing spring, measure the wire with calipers and match exactly. If designing a new application, choose 0.6mm for lighter preload forces and 0.7mm where slightly more resistance is needed. When in doubt, order a small pack of each to test fit and feel.
Choose based on your use case: a pack of 5 is ideal for a single repair or prototype test. A pack of 10 suits small batch projects or keeping a spare on hand. Packs of 25 or 50 are cost-effective for workshop stock, production runs, or applications where springs are consumable items replaced periodically. Larger packs offer a lower per-unit cost.
