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When a mechanism fails to return, a valve sticks, or a small component loses its spring tension, the culprit is almost always an undersized or worn compression spring. Engineers, repair technicians, and hands-on DIYers who need a precise, consistent return force in a compact form factor will find this compression spring series a dependable solution across a wide range of applications.
Each spring in this series is formed from round wire with a diameter of 0.8mm (approximately 0.031 in), wound into a cylindrical coil body. Outer diameters span 5mm to 16mm (approx. 0.20 in to 0.63 in), and free lengths range from 10mm to 100mm (approx. 0.39 in to 3.94 in). Pack sizes are 10 pieces for lengths up to 50mm and 5 pieces for longer lengths of 60–100mm.
Typical use cases include electronic device button return mechanisms, small appliance internal assemblies, automotive trim clip retention, model engineering and robotics projects, and general-purpose compression spring replacement in DIY repair work requiring a compact 0.8mm wire compression spring with a specific outer diameter.
| Wire Diameter | 0.8 mm (approx. 0.031 in) |
|---|---|
| Outer Diameter (OD) | 5 / 6 / 7 / 8 / 9 / 10 / 11 / 12 / 13 / 14 / 15 / 16 mm |
| Free Length | 10 / 15 / 20 / 25 / 30 / 35 / 40 / 45 / 50 / 60 / 70 / 80 / 90 / 100 mm |
| Coil Type | Cylindrical compression |
| End Type | See variant options |
| Spring Rate | See variant options |
| Material | See variant options |
| Surface Finish | See variant options |
| Pack Size | 10 pcs (lengths 10–50mm) / 5 pcs (lengths 60–100mm) |
| Load Direction | Axial compression |
Measure the inner diameter of the housing bore or the outer diameter of the guide rod your spring will seat against. For a bore-guided spring, the OD should be 0.5–1.5mm smaller than the bore to allow free movement without binding. For a rod-guided spring, the inner diameter (OD minus twice the wire diameter) should be 0.5–1mm larger than the rod. With a 0.8mm wire, the inner diameter equals OD minus 1.6mm.
Free length is the uncompressed length of the spring. You need a free length longer than your required working length by at least the amount of travel (deflection) your application demands. As a starting point, choose a free length that is 20–40% longer than the compressed working length to ensure the spring remains in its elastic range and does not coil-bind during operation.
Spring rate depends on wire diameter, outer diameter, free length, and number of active coils. A 0.8mm wire spring is suited to light-duty applications — typically in the range of a few tenths of a Newton per millimeter up to a few N/mm depending on OD and length. For precise load requirements, contact us to confirm the spring rate of your selected variant before ordering.
These springs are intended for general indoor mechanical use. If your application involves moisture, salt spray, or chemical exposure, please contact us to confirm the wire material and surface finish of your selected variant. For demanding environments, a stainless steel or coated spring may be more appropriate.
Yes. The 0.8mm wire diameter and small OD options (5–8mm) are well suited to button return mechanisms, contact springs, and small actuator assemblies in consumer electronics, instrumentation, and model engineering. Verify the free length and OD against your component pocket dimensions before ordering.
Variants with free lengths of 10mm to 50mm are supplied in packs of 10 pieces. Variants with free lengths of 60mm to 100mm are supplied in packs of 5 pieces. The pack size is shown in the "Length & Pack Size" variant option so you can confirm quantity before adding to cart.
Check three dimensions: outer diameter (must fit your bore or clear your guide rod), free length (must provide adequate travel), and wire diameter (determines load capacity). If you are replacing an existing spring, measure the original with calipers. If you are designing a new assembly, use the spring rate formula or contact us with your load and deflection requirements for a recommendation.
