Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.
Finding a compression spring that fits your exact bore, shaft, or housing can be a frustrating trial-and-error process — especially when off-the-shelf packs offer only one or two sizes. These 20mm compression springs are designed for makers, engineers, and repair technicians who need a reliable, dimensionally accurate spring without ordering custom tooling. Whether you are prototyping a mechanism, replacing a worn component, or stocking a workshop, this range covers the widths and wire gauges most commonly needed in light-to-medium duty applications.
Each spring has a free length of 20 mm (approximately 0.79 in). Outer diameters span from 1.5 mm to 25 mm (roughly 0.06 in to 0.98 in), and wire diameters range from 0.2 mm to 1.4 mm (approximately 0.008 in to 0.055 in). Three material options are available: 304 stainless steel for corrosion resistance, spring steel for cost-effective general use, and zinc-plated carbon steel for moderate environmental protection. Packs are sold in 5-piece or 10-piece quantities depending on the variant selected.
These 20mm compression springs suit a wide range of applications including electronic button and switch mechanisms requiring a small-diameter compression spring, precision instrument assemblies where a low-load miniature compression spring is needed, and light mechanical linkages or valve returns where a short-travel stainless steel compression spring provides reliable reset force.
Outer diameters from 1.5 mm to 25 mm and wire diameters from 0.2 mm to 1.4 mm — one listing covers dozens of precise size combinations.
Choose 304 stainless steel for corrosion resistance, spring steel for general-purpose strength, or zinc-plated steel for moderate protection at a lower cost.
All variants share a 20 mm (≈ 0.79 in) free length, making it straightforward to compare load characteristics across wire diameters.
Springs feature closed coil ends for stable seating on flat surfaces, reducing lateral shift under compression load.
Available in 10-piece packs (stainless and spring steel) or 5-piece packs (zinc-plated), so you can stock spares without over-ordering.
Suited for electronics, instruments, light machinery, model engineering, and repair work where a compact compression spring with defined travel is required.
| Free Length | 20 mm (≈ 0.79 in) |
|---|---|
| Outer Diameter Range | 1.5 mm – 25 mm (≈ 0.06 in – 0.98 in) |
| Wire Diameter Range | 0.2 mm – 1.4 mm (≈ 0.008 in – 0.055 in) |
| Material Options | 304 Stainless Steel / Spring Steel / Zinc-Plated Carbon Steel |
| End Type | Closed ends |
| Spring Rate | See variant options |
| Load at Solid Height | See variant options |
| Surface Finish | Natural (stainless & spring steel) / Zinc-plated |
| Pack Quantity | 5 pcs (zinc-plated) / 10 pcs (stainless & spring steel) |
| Operating Temperature | See variant options |
Measure the bore or housing inner diameter where the spring will sit. The spring's outer diameter should be slightly smaller than the bore to allow free movement without binding. If the spring seats on a shaft, the shaft outer diameter should be smaller than the spring's inner diameter (outer diameter minus twice the wire diameter). Select your variant accordingly from the Diameter option above.
304 stainless steel offers good corrosion resistance and is suitable for humid, wet, or mildly corrosive environments. Spring steel (typically 65Mn or similar) provides slightly higher tensile strength and is more cost-effective for dry indoor applications. If your application involves moisture or outdoor exposure, stainless steel is the recommended choice.
The 304 stainless steel variants offer good resistance to atmospheric corrosion and light moisture. The zinc-plated variants provide moderate protection for occasional outdoor exposure. Spring steel variants without coating are best kept in dry indoor environments. For highly corrosive or salt-spray conditions, stainless steel is the appropriate selection.
Spring rate increases with wire diameter. A thicker wire (e.g., 1.2 mm or 1.4 mm) produces a stiffer spring that requires more force to compress the same distance compared to a thinner wire (e.g., 0.2 mm or 0.3 mm). If you need a softer, more compliant spring, choose a smaller wire diameter. If you need a firm return force, choose a larger wire diameter.
Yes. The smaller diameter variants (outer diameter 1.5 mm – 6 mm, wire diameter 0.2 mm – 0.5 mm) are well suited for button mechanisms, tactile switches, pen clips, and precision instrument reset functions. The consistent 20 mm free length makes them easy to integrate into compact assemblies where travel distance is defined.
The 10-piece packs (stainless steel and spring steel variants) are ideal when you need spares on hand or are building multiple units. The 5-piece zinc-plated packs suit single-use repairs or prototyping where you want to test fit before committing to a larger quantity. Select the "Material Selection & Qty" option above to choose your preferred pack size and material combination.
Solid height depends on the number of coils and wire diameter of the specific variant. As a general estimate, solid height equals the wire diameter multiplied by the total number of active coils. For exact solid height values for a specific size combination, please contact us to confirm before ordering for critical applications.
