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When a project demands consistent return force in a compact footprint, finding the right compression spring can be frustrating — wrong wire gauge, wrong free length, wrong coil diameter. These 0.9mm wire compression springs are stocked in a wide matrix of coil diameters (5–16mm / 0.20–0.63 in) and free lengths (8–50mm / 0.31–1.97 in), so hobbyists, engineers, and repair technicians can match the exact geometry their application requires without custom ordering.
Each spring is formed from round 0.9mm (approx. 20 AWG equivalent) spring steel wire, wound into a cylindrical open-coil body. Coil outer diameters span 5mm through 16mm, and free lengths range from 8mm to 50mm, giving you a broad selection of spring rates and travel distances. Packs contain 10 identical springs for consistent batch use or spares.
Typical use cases include: electronic button and switch return mechanisms where a small-diameter compression spring for electronics is needed; DIY mechanical assemblies such as latches, pen mechanisms, and valve actuators requiring a small coil spring with controlled deflection; and light-load industrial fixtures or jigs where a precision compression spring in 0.9mm wire diameter provides repeatable preload without permanent set.
Nine coil diameters (5–16mm) combined with up to twelve free lengths (8–50mm) per diameter give you precise geometry matching without custom tooling.
Consistent 0.9mm wire diameter delivers a predictable spring rate and smooth coil-to-coil contact, reducing noise and uneven deflection under load.
Each variant ships as a pack of 10 identical springs — enough for batch builds, prototyping runs, or keeping spares on hand for maintenance.
Standard open-coil geometry allows linear compression along the axis with predictable deflection, suitable for both static preload and dynamic cycling applications.
Wound from spring steel wire with inherent elasticity and fatigue resistance, these springs maintain their free length through repeated compression cycles under rated loads.
With ODs starting at just 5mm, these springs fit into tight bores and recessed pockets common in electronics enclosures, pen mechanisms, and miniature actuators.
| Wire Diameter | 0.9mm (approx. 0.035 in) |
|---|---|
| Coil Outer Diameter | 5mm / 6mm / 7mm / 8mm / 9mm / 10mm / 12mm / 14mm / 16mm |
| Free Length Range | 8mm – 50mm (0.31 in – 1.97 in) |
| Coil Type | Open-coil cylindrical |
| Material | Spring steel |
| Surface Finish | See variant options |
| Spring Rate | See variant options |
| End Type | See variant options |
| Pack Quantity | 10 pieces per pack |
| Weight (per pack) | See variant options |
Measure the bore or pocket that will house the spring. The spring's outer diameter (OD) should be slightly smaller than the bore ID to allow free movement without binding. For a shaft-guided spring, the spring's inner diameter (ID) should be slightly larger than the shaft OD. Select from the 5–16mm OD options to match your clearance requirements.
Load capacity depends on the combination of wire diameter, coil diameter, free length, and number of active coils. A 0.9mm wire spring is suited to light-duty applications — typically button returns, pen mechanisms, small latches, and electronic switch assemblies. For heavy structural loads, a larger wire diameter is recommended. Contact us to confirm suitability for your specific load and deflection requirements.
These springs are made from spring steel, which offers good mechanical properties but has limited inherent corrosion resistance compared to stainless steel. For outdoor, humid, or chemically exposed environments, consider applying a protective coating or selecting stainless steel springs. For indoor, dry, or lightly exposed applications, spring steel performs reliably.
Yes. The small OD range starting at 5mm makes these springs well suited for button contacts, battery terminals, and switch return mechanisms on PCBs and in electronic enclosures. Verify the free length and compressed height against your assembly's travel clearance before ordering.
Free length is the spring's natural, unloaded length — the dimension listed in the variant options (e.g., 10mm, 25mm, 50mm). Compressed length (solid height) is the minimum length when all coils are touching under full load. Your application must have enough travel clearance between free length and solid height to achieve the desired deflection and force.
Determine the installed (preloaded) length and the fully compressed length your assembly requires. The spring's free length should be longer than the installed length so it exerts a preload force. Choose a free length from the available options (8mm–50mm) that gives you the deflection range and force profile your application needs. When in doubt, select a longer free length and trim your design clearance accordingly.
Each variant is sold as a pack of 10 identical springs. This pack format is ideal for prototyping, batch assembly, and keeping maintenance spares. If you need larger quantities, contact us to discuss bulk pricing options.
