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When your project demands a reliable, compact spring that won't buckle under repeated load cycles, finding the right wire diameter and coil geometry matters. Engineers, hobbyists, and makers working on electronics enclosures, pen mechanisms, valve assemblies, and precision instruments often struggle to source small-diameter compression springs in exact sizes — these 0.8mm wire diameter compression springs solve that problem with a broad selection of outer diameters and lengths in one listing.
Each spring is wound from steel wire with a nominal wire diameter of 0.8mm (approximately 0.031"). Outer diameters span 7mm to 11mm (roughly 0.28" to 0.43"), and free lengths range from 10mm to 100mm (approximately 0.39" to 3.94"). The compact coil geometry suits tight clearance bores and lightweight assemblies where space is at a premium.
Typical use cases include pen and stylus click mechanisms requiring consistent return force, small appliance button assemblies where a 0.8mm wire compression spring provides repeatable actuation, model engineering and robotics joints needing a miniature coil spring for tension balancing, and electronic component fixtures where a small OD compression spring holds contacts under controlled preload.
Consistent 0.8mm wire cross-section delivers uniform spring rate across the full coil length, suitable for light-load precision applications.
Outer diameters from 7mm to 11mm and free lengths from 10mm to 100mm let you match the exact geometry your assembly requires without custom fabrication.
Uniform coil pitch throughout the body ensures even load distribution and predictable deflection behavior under compression.
Available in packs of 5, 10, 30, 50, 100, and 200 pieces — order the exact quantity you need for prototyping, repair, or production runs.
End coils are closed to provide a flat seating surface, improving stability and reducing lateral deflection when the spring is under load.
Compact OD range of 7–11mm fits standard small-bore housings used in pens, switches, valves, and miniature mechanical assemblies.
| Wire Diameter | 0.8mm (approx. 0.031") |
|---|---|
| Outer Diameter Range | 7mm – 11mm (approx. 0.28" – 0.43") |
| Free Length Range | 10mm – 100mm (approx. 0.39" – 3.94") |
| Material | See variant options |
| Surface Finish | See variant options |
| Spring Rate | See variant options |
| End Type | Closed ends |
| Coil Direction | Right-hand wound (typical) |
| Load Type | Compression |
| Available Quantities | 5 / 10 / 30 / 50 / 100 / 200 Pcs |
The outer diameter (OD) of the spring should be slightly smaller than the bore or housing it sits in, and the inner diameter (ID = OD minus 2× wire diameter) should be slightly larger than any guide rod. For this spring, OD ranges from 7mm to 11mm. Measure your bore and rod clearances first, then select the closest matching size from the variant options above.
A 0.8mm wire diameter spring is designed for light-duty applications. Exact load capacity depends on the selected OD, free length, and material. These springs are suited for pen mechanisms, small switches, electronic fixtures, and similar low-force assemblies. For precise load calculations, use the spring rate formula or contact us with your deflection and force requirements.
Corrosion resistance depends on the material and finish of the specific variant. Standard steel springs offer moderate resistance in dry indoor environments. If your application involves moisture, chemicals, or outdoor exposure, please contact us to confirm the material specification before ordering.
Yes, provided the wire diameter (0.8mm), outer diameter, and free length match your OEM specification. Measure the original spring carefully — wire diameter, OD, and free length — then select the matching size variant. If your exact size is not listed, contact us to discuss availability.
Free length is the spring's natural, unloaded length — the dimension listed in the size variants (e.g., 10mm, 50mm, 100mm). Compressed length (solid height) is the minimum length when all coils are touching. For a 0.8mm wire spring, solid height is approximately equal to the number of total coils multiplied by 0.8mm. Always ensure your assembly travel does not compress the spring to solid height under normal operation.
For prototyping or single repairs, the 5 or 10 piece packs are cost-effective and reduce excess inventory. For production runs, maintenance kits, or applications where springs are consumable (e.g., high-cycle mechanisms), the 30, 50, 100, or 200 piece packs offer a lower per-unit cost. Select the quantity that matches your expected usage volume.
The size format follows the convention: Wire Diameter × Outer Diameter × Free Length. So "0.8 x 7 x 10mm" means a spring with 0.8mm wire diameter, 7mm outer diameter, and 10mm free length. Use all three dimensions to confirm compatibility with your assembly before ordering.
