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When a failed spring brings a mechanism to a halt, finding the right replacement fast is critical. Whether you are a hobbyist repairing a tool, a maker prototyping a mechanism, or a maintenance technician sourcing a direct replacement, these 305mm long compression springs deliver consistent, measurable resistance across a wide range of coil diameters and wire gauges.
Each spring is wound from round wire with a uniform helical pitch. Available materials include 304 stainless steel (corrosion-resistant), 65Mn spring steel (high elasticity, cost-effective), and carbon spring steel (high fatigue strength). Wire diameters range from 0.3 mm to 3.5 mm (approx. 0.012 in – 0.138 in), and coil outer diameters span 3 mm to 50 mm (approx. 0.12 in – 1.97 in). Free length is 305 mm (approx. 12 in) across all variants.
Typical applications include compression spring replacement in jigs and fixtures, return-spring mechanisms in DIY automation projects, load-bearing assemblies in light machinery, and prototype spring selection for engineering students and makers sourcing small-batch compression springs by wire diameter.
Consistent 305 mm (≈12 in) free length across all variants for straightforward drop-in replacement or design reference.
Wire diameters from 0.3 mm to 3.5 mm; coil outer diameters from 3 mm to 50 mm — covering a broad range of load and deflection needs.
304 stainless steel for corrosion resistance, 65Mn spring steel for high elasticity, and carbon spring steel for fatigue strength — choose the right alloy for your environment.
Consistent coil spacing ensures even load distribution and predictable spring rate throughout the compression stroke.
Flat, closed ends provide stable seating on spring pads and reduce lateral buckling tendency during compression.
Available in 1, 2, 3, or 5-piece packs depending on material — ideal for prototyping single units or stocking small batches.
| Free Length | 305 mm (approx. 12 in) |
|---|---|
| Wire Diameter Range | 0.3 mm – 3.5 mm (0.012 in – 0.138 in) |
| Outer Diameter Range | 3 mm – 50 mm (0.12 in – 1.97 in) |
| Material Options | 304 Stainless Steel / 65Mn Spring Steel / Carbon Spring Steel |
| Spring Type | Helical compression spring, closed ends |
| Surface Finish | See variant options |
| Spring Rate | See variant options |
| Max Load | See variant options |
| Quantity per Pack | 1 / 2 / 3 / 5 pcs (varies by variant) |
Wire diameter determines the spring rate and load capacity — thicker wire produces a stiffer spring. Coil outer diameter must fit inside your bore or over your guide rod with clearance. Start by measuring your bore ID (subtract 1–2 mm for clearance to get the max OD) and your required load at a known deflection, then select the wire/coil combination that meets both constraints.
304 stainless steel offers good corrosion resistance and is suitable for humid or mildly corrosive environments. 65Mn spring steel provides high elasticity and fatigue resistance at a lower cost, making it ideal for dry indoor mechanical applications. Carbon spring steel (offered in multi-pack variants) delivers high fatigue strength for repetitive cycling applications. Choose stainless for outdoor or wet environments, 65Mn for general-purpose indoor use, and carbon spring steel when cycle life is the priority.
The 304 stainless steel variants offer good resistance to oxidation and mild corrosion. The 65Mn and carbon spring steel variants are not inherently corrosion-resistant and should be used in dry environments or protected with a suitable coating if moisture exposure is expected.
These are general-purpose compression springs compatible with any mechanism that uses a helical compression spring with a 305 mm free length. Common uses include jigs, fixtures, return mechanisms, valve assemblies, DIY automation, and prototype builds. Verify that your spring seat or bore matches the selected outer diameter before ordering.
Single-piece packs are ideal for prototyping or replacing a single failed spring. Multi-piece packs (2, 3, or 5 pcs) are available for certain spring steel variants and offer better value when you need spares, are building multiple assemblies, or want to test several units before committing to a larger order.
The stainless steel variants are the best choice for outdoor or damp environments due to their corrosion resistance. For fully submerged or highly corrosive environments, additional protective measures may be needed. The 65Mn and spring steel variants are recommended for dry indoor use only.
Measure the free length (uncompressed), outer diameter, and wire diameter of your existing spring using calipers. Match these three dimensions to the variant options above. If your spring is slightly compressed in its resting position, measure it in the free (unloaded) state for an accurate free length reading.
