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When a worn-out or undersized spring causes equipment to fail mid-task, the cost is more than inconvenience — it's downtime. Whether you're a mechanical engineer sourcing replacement parts, a workshop technician maintaining machinery, or a DIY builder assembling custom fixtures, having the right compression spring on hand makes all the difference. These 120mm compression springs are engineered for consistent force delivery and long service life across a wide range of applications.
Each spring is formed from 304 stainless steel wire, offering a balanced combination of tensile strength and corrosion resistance. Wire diameters range from 0.3mm to 2mm (0.012" to 0.079"), and outer diameters span 3mm to 25mm (0.12" to 0.98"), with a fixed free length of 120mm (4.72"). The open-coil helical design allows for linear compression under axial load, making these springs suitable for both light-duty and moderate-load scenarios.
Typical use cases include spring-loaded valve assemblies, pen and clicker mechanisms, electronic device button returns, jig and fixture tensioning, and small appliance repair. Long-tail applications such as "stainless steel compression spring 120mm replacement" and "304 SS pressure spring for DIY projects" are well served by this range's breadth of wire and outer diameter combinations.
Formed from 304-grade stainless steel wire for solid corrosion resistance in humid, wet, and mildly acidic environments — outlasting carbon steel alternatives in exposed installations.
Wire diameters from 0.3mm to 2mm paired with outer diameters from 3mm to 25mm give you precise control over spring rate and load capacity — all at a fixed 120mm free length.
Open-coil helical geometry ensures predictable, linear compression behavior under axial load — critical for applications requiring repeatable force curves such as valve seats and button returns.
Suitable for mechanical assemblies, electronic devices, jigs, fixtures, small appliances, and custom DIY builds where a reliable compression element is needed.
Uniform coil pitch and consistent wire cross-section reduce stress concentration points, supporting extended cycle life under repeated compression and release.
Available in 1PCS increments so you can source exactly the quantity you need — ideal for prototyping, repair, or topping up specific sizes without over-ordering.
| Material | 304 Stainless Steel |
|---|---|
| Free Length | 120mm (4.72") |
| Wire Diameter Range | 0.3mm – 2mm (0.012" – 0.079") |
| Outer Diameter Range | 3mm – 25mm (0.12" – 0.98") |
| Spring Type | Open-Coil Helical Compression |
| End Type | See variant options |
| Surface Finish | Natural (uncoated stainless) |
| Coil Direction | Right-hand |
| Spring Rate | See variant options |
| Max Load Capacity | See variant options |
| Operating Temperature | Typically –20°C to +200°C (–4°F to +392°F) |
| Quantity per Order | 1PCS |
Start with your bore or housing inner diameter — the spring's outer diameter must fit inside with clearance (typically 0.5–1mm). Then match wire diameter to your required spring rate: thicker wire produces a stiffer spring. If you're replacing an existing spring, measure the original's wire dia, OD, and free length directly. Use the variant selector above to find the combination that matches your specs.
These springs are suited for light-to-moderate load applications. Heavier wire diameters (1.5mm–2mm) in this range can handle more substantial axial loads. For safety-critical or high-cycle industrial applications, verify the spring rate and maximum load against your engineering requirements. Contact us to confirm if you need specific load data for a variant.
304 stainless steel provides solid resistance to oxidation and corrosion in most outdoor, humid, and mildly saline environments. It outperforms carbon steel significantly in wet conditions. For highly aggressive environments (e.g., marine saltwater immersion or strong acids), 316 stainless steel would be a more appropriate choice. For general outdoor DIY and workshop use, 304 SS performs reliably.
These springs are compatible with a broad range of applications including: spring-loaded valve and plunger assemblies, pen and clicker return mechanisms, electronic device button springs, jig and fixture tensioning, small appliance repair, custom DIY mechanical builds, and prototype development. Always verify OD, wire dia, and free length match your assembly's dimensional constraints.
Yes — each listing is sold in 1PCS increments, so you can order exactly the quantity you need. This is ideal for repair jobs, prototyping, or sourcing a specific size without committing to a bulk pack. Simply select your wire diameter and outer diameter combination above and add to cart.
Use a digital caliper to measure: (1) Free length — the spring's total length when uncompressed; (2) Outer diameter — measured across the widest point of the coil; (3) Wire diameter — the thickness of the wire itself. Match these three values to the variant options above. If your existing spring is slightly compressed in its seat, measure it removed from the assembly for an accurate free length reading.
These springs use a standard right-hand coil winding. For most compression applications — where the spring is simply compressed axially — coil direction does not affect performance. Coil direction only becomes relevant in specific rotational or nested-spring configurations. If your application requires a left-hand coil, please contact us before ordering.
