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When a loose fit, premature fatigue, or wrong spring rate derails your build, the root cause is almost always an undersized or mismatched spring. Makers, engineers, and repair technicians who need a reliable, compact compression spring in a fine wire gauge will find this 0.8mm wire diameter series purpose-built for tight-tolerance assemblies where every millimetre counts.
Each spring is formed from stainless steel wire with a nominal wire diameter of 0.8 mm (approx. 0.031 in). Outer diameters span 5 mm to 15 mm (approx. 0.20 in – 0.59 in), and free lengths range from 5 mm to 100 mm (approx. 0.20 in – 3.94 in). Packs are sold in 10-piece sets for shorter lengths and 5-piece sets for longer lengths (60 mm and above), giving you spares for prototyping or replacement.
Typical use cases include small compression spring for electronics enclosures and PCB push-button mechanisms, miniature return spring for pen clickers and retractable tools, and light-load die spring replacement in hobby CNC fixtures and 3D-printer extruder assemblies.
Consistent 0.8 mm wire gauge across all variants ensures predictable spring rate and easy sourcing for repeat builds.
Outer diameters from 5 mm to 15 mm and free lengths from 5 mm to 100 mm cover the majority of compact mechanism requirements in a single product family.
Stainless steel wire resists oxidation and mild corrosion, making these springs suitable for humid environments and long-term storage without surface degradation.
Shorter variants ship in 10-piece packs; longer variants (60 mm+) in 5-piece packs — enough for prototyping, repair, and keeping spares on hand.
Springs in this wire diameter range typically feature closed ends for stable seating in bored housings and flat-bottomed pockets.
Uniform coil spacing delivers repeatable deflection behaviour, reducing variability between units in multi-spring assemblies such as keyboard switches or valve returns.
| Wire Diameter | 0.8 mm (0.031 in) |
|---|---|
| Outer Diameter | 5 mm – 15 mm (0.20 in – 0.59 in) — See variant options |
| Free Length | 5 mm – 100 mm (0.20 in – 3.94 in) — See variant options |
| Material | Stainless Steel |
| End Type | Closed (typical for this wire gauge) |
| Spring Rate | See variant options |
| Quantity per Pack | 10 pcs (lengths ≤50 mm) / 5 pcs (lengths ≥60 mm) |
| Finish | Natural stainless (uncoated) |
| Application | Light-load compression, return, and cushioning mechanisms |
Measure the inner diameter of the bore or pocket that will house the spring, then select an outer diameter 0.5–1 mm smaller to allow free movement. For free length, choose a spring whose free length is at least 20–30% longer than your required compressed length to stay within the elastic range.
Spring rate varies by outer diameter and free length combination. As a general guide, shorter springs with smaller outer diameters will have a higher rate (stiffer), while longer springs with larger outer diameters will be softer. Contact us with your specific variant if you need an estimated rate for your application.
Yes. The springs are made from stainless steel, which provides good resistance to oxidation and mild corrosion in typical indoor and moderately humid environments. For highly corrosive or submerged applications, please confirm suitability with your engineering team.
These springs are well-suited for push-button mechanisms, pen and retractable tool returns, 3D printer extruder assemblies, hobby CNC fixtures, keyboard switch modifications, small valve returns, and any light-load spring-loaded mechanism requiring a 0.8 mm wire gauge. Always verify the outer diameter fits your housing bore before ordering.
Springs 60 mm and longer are heavier and bulkier per unit. The 5-piece pack keeps the price accessible while still providing enough units for most repair and prototyping tasks. If you need larger quantities, consider ordering multiple packs.
Stainless steel offers better moisture resistance than carbon steel springs, making these suitable for occasional outdoor exposure or humid workshops. For continuous outdoor or submerged use, additional protective measures or a higher-grade stainless alloy may be advisable.
Calculate the solid height: multiply the wire diameter (0.8 mm) by the total number of coils. Ensure your minimum working length (compressed length) is greater than the solid height. If you are unsure of the coil count for a specific variant, contact us before ordering.
