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When a loose fit, inconsistent return force, or premature spring fatigue derails your project, the root cause is almost always a mismatched spring spec. Engineers, makers, and repair technicians who need a reliable compression spring in a compact 25mm free length will find this range covers the widest selection of wire diameters and outer diameters available in a single listing.
Each spring is wound from round wire with a free length of 25mm (approximately 0.98 in). Wire diameters span 0.2mm to 1.4mm (0.008–0.055 in), and outer diameters range from 1.5mm to 24mm (0.06–0.94 in). Material options include 304 stainless steel, carbon spring steel, and zinc-plated carbon steel, sold in packs of 5 or 10 pieces depending on the selected variant.
Typical applications include compression spring for electronics enclosures and battery contacts, small compression spring for 3D printer extruder mechanisms, miniature compression spring for robotics and automation assemblies, and replacement pressure spring for precision instruments and jigs.
Outer diameters from 1.5mm to 24mm and wire diameters from 0.2mm to 1.4mm let you match the exact bore and load spec your design requires.
Choose 304 stainless steel for corrosion resistance, carbon spring steel for higher elasticity, or zinc-plated steel for a cost-effective general-purpose solution.
All variants share a uniform 25mm (≈0.98 in) free length, simplifying drop-in replacement across multiple assemblies without re-engineering the housing.
Springs feature closed ends for stable seating and even load distribution, reducing lateral buckling in confined guide channels.
Available in 5-piece (zinc) or 10-piece (stainless / spring steel) packs — ideal for prototyping, small-batch production, or keeping spares on hand.
The 304 stainless steel variants withstand moisture and mild chemical exposure, making them suitable for outdoor fixtures, food-adjacent equipment, and humid environments.
| Free Length | 25 mm (≈ 0.98 in) |
|---|---|
| Outer Diameter Range | 1.5 mm – 24 mm (0.06 – 0.94 in) |
| Wire Diameter Range | 0.2 mm – 1.4 mm (0.008 – 0.055 in) |
| Material Options | 304 Stainless Steel / Carbon Spring Steel / Zinc-Plated Carbon Steel |
| End Type | Closed ends (typical for this size range) |
| Spring Type | Compression (helical) |
| Pack Quantity | 5 pcs (Zinc) / 10 pcs (Stainless Steel & Spring Steel) |
| Load Capacity | See variant options |
| Spring Rate | See variant options |
| Surface Finish | Natural (Stainless) / Natural (Spring Steel) / Zinc-plated |
Measure the inner bore or guide rod your spring will seat in. The spring's outer diameter should be slightly smaller than the bore (typically 0.1–0.3mm clearance) or slightly larger than the guide rod. Wire diameter determines stiffness — a thicker wire produces a stiffer spring with higher load capacity. Use the variant selector to match both dimensions to your design drawings.
304 stainless steel offers good corrosion resistance and is suitable for humid or mildly corrosive environments. Carbon spring steel (uncoated) provides slightly higher tensile strength and elasticity, making it preferred for high-cycle mechanical applications where corrosion is not a concern. Zinc-plated carbon steel offers basic corrosion protection at a lower cost, suitable for indoor general-purpose use.
The 304 stainless steel variants are the best choice for outdoor or damp conditions, as they resist rust and mild chemical exposure. Carbon spring steel variants are not recommended for prolonged moisture exposure without additional protective coating. Zinc-plated variants offer limited corrosion protection suitable for light indoor use.
Yes. The compact 25mm free length and wide diameter range make these springs well-suited for 3D printer extruder assemblies, bed-leveling mechanisms, and CNC fixture clamps. Select the wire diameter that matches your required preload force and the outer diameter that fits your guide channel or housing bore.
Spring rate (k) = (G × d⁴) / (8 × D³ × n), where G is the shear modulus of the material, d is wire diameter, D is mean coil diameter, and n is the number of active coils. For most DIY and light mechanical applications, selecting a wire diameter in the mid-range (0.4–0.8mm) for your outer diameter provides a balanced stiffness. If you need precise load data for a specific variant, contact us to confirm.
Stainless steel and spring steel variants are sold in 10-piece packs. Zinc-plated variants are sold in 5-piece packs. For bulk or wholesale quantities beyond the listed pack sizes, please contact us directly through the store's contact page to discuss volume pricing.
Yes, all dimensions listed (outer diameter, wire diameter, free length) follow standard metric measurements. Tolerances are typical for commercially wound compression springs in this size range (generally ±5–10% on spring rate, ±0.1mm on wire diameter). For precision-critical applications, verify with a caliper upon receipt.
