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When a project demands consistent push-back force — whether you're repairing a mechanism, building a custom fixture, or replacing a worn-out component — finding the right compression spring in the right size can be frustrating. These 305mm long compression coil springs are engineered for makers, engineers, and tradespeople who need a dependable, precisely sized spring without over-engineering the spec sheet.
Each spring is manufactured from either Stainless Steel (304 grade, corrosion-resistant) or Spring Steel (high-carbon, high-elasticity), with wire diameters ranging from 0.3 mm to 5 mm (approx. 0.012" to 0.197") and outer diameters from 3 mm to 62 mm (approx. 0.118" to 2.44"). All springs share a consistent free length of 305 mm (approx. 12.0").
Typical use cases include: DIY mechanical assemblies requiring controlled return force, light-to-medium industrial machinery maintenance (conveyor guides, valve actuators, jig fixtures), and hobbyist robotics or automation projects where repeatable spring deflection is critical.
Choose Stainless Steel (304) for corrosion resistance in wet or outdoor environments, or Spring Steel for superior elasticity and fatigue life in high-cycle indoor use.
Wire diameters from 0.3 mm to 5 mm; outer diameters from 3 mm to 62 mm — all at a consistent 305 mm free length, covering a broad spectrum of load and deflection requirements.
Uniform coil pitch and wire cross-section ensure a predictable, linear spring rate across the full compression stroke — critical for repeatable force applications.
Stainless Steel variants resist oxidation and surface rust, making them suitable for food-adjacent, marine-adjacent, or outdoor DIY installations without additional coating.
Spring Steel variants are cold-wound from high-carbon wire, delivering excellent fatigue resistance for repetitive compression cycles in mechanical assemblies and automation rigs.
Tightly controlled winding tolerances keep outer diameter and free length within spec, ensuring drop-in fitment in standard spring housings and guide rods without modification.
| Spring Type | Compression (Coil) |
|---|---|
| Free Length | 305 mm (approx. 12.0") |
| Wire Diameter Range | 0.3 mm – 5 mm (0.012" – 0.197") |
| Outer Diameter Range | 3 mm – 62 mm (0.118" – 2.44") |
| Material Options | Stainless Steel (304) / Spring Steel (High-Carbon) |
| Surface Finish | Natural / Uncoated |
| End Type | See variant options |
| Spring Rate | See variant options |
| Load Capacity | See variant options |
| Coil Direction | Right-hand wound (standard) |
| Operating Temperature | Stainless Steel: up to ~300°C; Spring Steel: up to ~120°C (typical) |
| Quantity per Order | 1 piece |
Start with your housing bore (inner diameter of the cavity the spring sits in) — the spring's outer diameter should be 0.5–1 mm smaller than the bore for clearance. Then select a wire diameter based on the load you need: thicker wire = higher spring rate and load capacity. If you're unsure, select a mid-range wire diameter (e.g., 1–1.5 mm) and test deflection before committing to a final spec.
Stainless Steel (304) offers excellent corrosion resistance and is ideal for humid, outdoor, or food-adjacent environments. Spring Steel (high-carbon) provides superior elasticity and fatigue life, making it better suited for high-cycle indoor mechanical applications where corrosion is not a concern. If in doubt about environment, choose Stainless Steel.
The Stainless Steel (304) variants are suitable for general outdoor and light marine-adjacent use due to their oxidation resistance. Spring Steel variants are not recommended for prolonged outdoor or wet exposure without additional protective coating, as high-carbon steel can surface-rust over time.
Compression springs can be cut shorter, but doing so changes the spring rate and load characteristics. If you need a specific free length shorter than 305 mm, cutting is possible with a rotary tool or spring cutter, but the cut end should be ground flat to maintain even load distribution. We recommend selecting the closest standard length to your requirement rather than cutting.
Spring rate depends on wire diameter, outer diameter, number of active coils, and material. Thicker wire and smaller outer diameter generally produce a higher spring rate. Because this product covers a wide range of wire and outer diameter combinations, specific spring rate values vary by variant — please refer to the variant options or contact us with your load and deflection requirements for guidance.
Each order includes 1 piece of the selected spring variant. If you need multiple springs for a project, simply increase the quantity at checkout. Bulk pricing may be available — contact us for volume inquiries.
Yes — the springs are precision-wound to standard outer diameter tolerances, making them compatible with most off-the-shelf guide rods and spring housings. Ensure the guide rod diameter is smaller than the spring's inner diameter (outer diameter minus 2× wire diameter) and the housing bore is larger than the spring's outer diameter by at least 0.5 mm for smooth operation.
