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When a mechanism fails to return, a latch won't reset, or a valve seat loses its seating pressure, the culprit is almost always a fatigued or incorrectly sized compression spring. Engineers, repair technicians, and hands-on DIYers who need a compact, consistent spring with a 1.5mm wire diameter will find this range covers the most common small-bore applications without over-engineering the solution.
Each spring is formed from 1.5mm wire diameter steel, with outer diameters spanning 8mm to 25mm (approximately 0.31 in to 0.98 in) and free lengths from 15mm to 100mm (approximately 0.59 in to 3.94 in). The coil body is finished with a uniform pitch and squared, ground ends to ensure flat, stable seating against mating surfaces.
Typical use cases include small appliance return mechanisms, electronic enclosure latches, pen and stylus click assemblies, automotive sensor brackets, and light-duty valve springs — anywhere a compact compression spring with controlled deflection is required.
| Wire Diameter | 1.5 mm |
|---|---|
| Outer Diameter (OD) | 8 mm – 25 mm (see variant options) |
| Free Length | 15 mm – 100 mm (see variant options) |
| End Type | Squared and ground |
| Spring Type | Compression |
| Material | Steel (carbon spring steel) |
| Surface Finish | See variant options |
| Coil Direction | Right-hand (standard) |
| Pack Quantity | 5 pcs (lengths ≥60 mm) / 10 pcs (lengths ≤50 mm) |
| Spring Rate | See variant options |
| Max Load Capacity | See variant options |
Measure the spring pocket or guide pin diameter first. The spring OD should be 0.5–1.5mm smaller than the pocket bore to allow free movement without binding. For free length, measure the gap you need to fill at rest and add the required travel distance. Select the variant whose OD and free length most closely match those figures.
Load capacity depends on the specific OD and free length combination. Shorter springs with smaller OD and fewer active coils will have a higher spring rate and reach solid height sooner. For precise load data, contact us with your target deflection and load requirements so we can confirm the correct variant.
The surface finish provides resistance to light oxidation in typical indoor and sheltered outdoor environments. For continuous exposure to moisture, salt spray, or chemicals, consider stainless steel springs or apply an additional protective coating after installation. These springs are not rated for full immersion or marine environments.
Yes, provided the guide pin diameter is smaller than the spring's inner diameter (ID). The ID is approximately OD minus twice the wire diameter (ID ≈ OD − 3mm for 1.5mm wire). For example, an 8mm OD spring has an approximate ID of 5mm, suitable for guide pins up to ~4.5mm diameter. Verify your specific variant before assembly.
Yes. Springs in series (end-to-end) reduce the combined spring rate and increase total travel. Springs in parallel (side-by-side on the same axis) increase the combined spring rate. Ensure the guide arrangement prevents lateral buckling when stacking, especially for longer free lengths relative to OD.
Wire diameter directly affects spring rate and load capacity. A 1.5mm wire is suited for light-to-medium duty applications — think latches, small valves, pen mechanisms, and sensor brackets. If your application requires higher loads or greater fatigue resistance under repeated cycling, a thicker wire diameter (2mm or above) would be more appropriate. Match wire diameter to your load and deflection requirements.
Shorter springs (15mm–50mm free length) are sold in packs of 10 pieces, while longer springs (60mm–100mm free length) are sold in packs of 5 pieces. The pack size is shown in the variant name under "Length(mm) & Quantity(pcs)". All packs are priced per pack, not per individual spring.
