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When a project demands consistent return force and dimensional accuracy, a mismatched or undersized compression spring causes binding, premature fatigue, or complete mechanism failure. Engineers, makers, and repair technicians who need a reliable 50mm compression spring in a precise wire diameter and outer diameter can select exactly the combination they need from this listing — no guesswork, no bulk-order minimums.
Each spring in this listing is 50mm (≈1.97 in) in free length, wound from round wire ranging from 0.2mm to 1.4mm (≈0.008–0.055 in) in diameter. Outer diameters span 2mm to 25mm (≈0.08–0.98 in). Three material options are available: 304 stainless steel for corrosion resistance, carbon spring steel for high elasticity and fatigue life, and zinc-plated carbon steel for a cost-effective general-purpose choice.
Typical applications include CNC machine tool return mechanisms, 3D-printer extruder and bed-leveling assemblies, robotics joint preload, electronic switch and button actuation, automotive trim clips, and general DIY repair where a compact 50mm coil spring is needed. The wide size matrix makes this listing suitable for prototyping, small-batch production, and maintenance stock.
Consistent 50mm (≈1.97 in) free length across all variants ensures predictable deflection and force curves in your design.
Wire diameters from 0.2mm to 1.4mm and outer diameters from 2mm to 25mm let you match the exact spring index your application requires.
Choose 304 stainless steel for corrosion resistance, carbon spring steel for maximum elasticity, or zinc-plated steel for general-purpose use.
Closed ends provide a flat seating surface for stable load transfer and accurate alignment in bores and on posts.
Available in 10-piece packs (stainless & spring steel) or 5-piece packs (zinc), ideal for prototyping, repair stock, or small-batch production.
Uniform coil pitch throughout the active coils ensures linear spring rate behavior and repeatable performance across the compression cycle.
| Free Length | 50 mm (≈1.97 in) |
|---|---|
| Wire Diameter | 0.2 mm – 1.4 mm (≈0.008–0.055 in) — See variant options |
| Outer Diameter | 2 mm – 25 mm (≈0.08–0.98 in) — See variant options |
| Material | 304 Stainless Steel / Carbon Spring Steel / Zinc-Plated Carbon Steel — See variant options |
| End Type | Closed ends |
| Coil Direction | Right-hand wound |
| Spring Rate | See variant options |
| Pack Quantity | 5 pcs (Zinc) / 10 pcs (Stainless & Spring Steel) — See variant options |
| Surface Finish | Natural (Stainless) / Natural (Spring Steel) / Zinc Plated |
Start with the bore or post diameter in your assembly: the spring's outer diameter should be 0.5–1mm smaller than the bore (for guided springs) or the inner diameter should clear the post by a similar margin. Wire diameter determines spring rate and load capacity — thicker wire produces a stiffer spring. If you know the required load at a specific deflection, use the spring rate formula or contact us for guidance.
304 stainless steel offers good corrosion resistance and is suitable for humid, outdoor, or mildly chemical environments. Carbon spring steel (typically 65Mn or equivalent) provides higher tensile strength and fatigue life, making it preferred for high-cycle mechanical applications where corrosion is not a concern. Zinc-plated carbon steel is a cost-effective option for indoor, low-humidity environments.
The stainless steel variants offer the best corrosion resistance for outdoor or damp conditions. Zinc-plated springs provide moderate protection for light-duty indoor use. Carbon spring steel without plating is not recommended for prolonged exposure to moisture or chemicals. For marine or highly corrosive environments, stainless steel is the recommended choice.
Yes. The smaller outer diameter variants (2–6mm) are commonly used in 3D-printer bed-leveling assemblies, extruder mechanisms, and Z-axis preload. Larger diameters (8–25mm) suit CNC tool-change springs, spindle return mechanisms, and fixture clamps. Select the wire diameter that matches your required spring force at the operating deflection.
Measure the free length of your existing spring (should be 50mm), the outer diameter, and the wire diameter with calipers. Match these to the variant options in this listing. Also confirm the material is appropriate for your environment. If you are replacing a spring, note whether the original was stainless or carbon steel.
Stainless steel and spring steel variants are sold in 10-piece packs. Zinc-plated variants are sold in 5-piece packs. Each variant (wire diameter + outer diameter + material combination) is a separate listing option. To order multiple sizes, add each desired variant to your cart individually.
Spring rate varies by wire diameter and outer diameter combination. Thicker wire and smaller outer diameter produce a higher spring rate (stiffer). Thinner wire and larger outer diameter produce a lower spring rate (softer). Specific spring rate values depend on the selected variant — contact us with your wire diameter and outer diameter selection if you need a calculated spring rate estimate.
