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When a project demands consistent return force without the risk of rust, finding the right compression spring becomes critical. Engineers, hobbyists, and maintenance technicians who work with mechanical assemblies, jigs, or enclosures know the frustration of springs that corrode, lose tension, or simply don't come in the exact size needed. These galvanised compression springs are stocked in two wire diameters and a wide matrix of outer diameters and lengths so you can match the spec precisely.
Each spring is formed from carbon steel wire with a zinc galvanised coating, available in wire diameters of 1mm and 1.2mm. Outer diameters span 10mm to 20mm (approximately 0.39 in to 0.79 in), and free lengths range from 60mm to 100mm (approximately 2.36 in to 3.94 in). Springs are supplied with closed and ground ends for stable seating, and are sold in convenient packs of 5, 10, or 30 to suit both one-off repairs and batch production.
Typical applications include light-duty valve mechanisms and push-button assemblies, DIY drawer and cabinet hardware, prototype and maker projects requiring repeatable spring-back force, and general-purpose mechanical jigs where a compact galvanised compression spring is needed to maintain contact or return a component to its rest position.
A zinc galvanised finish provides a corrosion-resistant barrier, extending service life in humid or mildly exposed environments compared to bare steel springs.
Choose 1mm or 1.2mm wire diameter to match your load and deflection requirements. The 1.2mm wire delivers greater spring rate for applications needing firmer resistance.
Outer diameters from 10mm to 20mm combined with free lengths from 60mm to 100mm give you a broad selection to find the closest match to your design envelope.
Available in packs of 5, 10, or 30 — order a small trial pack or stock up for production runs without paying for more than you need.
Closed and ground end coils provide a flat, stable bearing surface for accurate load transfer and consistent seating in spring pockets or against flat plates.
Suited to DIY projects, prototype builds, light mechanical assemblies, valve returns, push-button mechanisms, and general maintenance tasks requiring a compact galvanised compression spring.
| Wire Diameter | 1mm / 1.2mm (see variant options) |
|---|---|
| Outer Diameter (OD) | 10mm – 20mm (see variant options) |
| Free Length | 60mm – 100mm (see variant options) |
| End Type | Closed and ground |
| Material | Carbon steel |
| Surface Finish | Zinc galvanised |
| Spring Type | Compression |
| Pack Quantity | 5 / 10 / 30 (see variant options) |
| Spring Rate | See variant options |
| Inner Diameter (ID) | See variant options |
Wire diameter directly affects spring rate (stiffness). A 1.2mm wire produces a stiffer spring with a higher load capacity for the same outer diameter and free length compared to 1mm wire. If your application requires a firmer return force or carries a heavier load, choose 1.2mm. For lighter-duty push-button or low-load return applications, 1mm is typically sufficient. When in doubt, calculate the required spring rate from your load and deflection values and compare against the variant specifications.
The outer diameter (OD) of the spring should be slightly smaller than the bore or pocket it sits in — typically 0.5mm to 1mm clearance on each side is a good starting point. For example, if your pocket is 14mm in diameter, a 13mm OD spring is a common choice. If the spring is guided on a rod instead, the inner diameter (ID) should be slightly larger than the rod diameter. Check the ID for your chosen variant before ordering.
These springs are manufactured from carbon steel wire and are designed for light-to-medium duty applications. The 1.2mm wire variants carry a higher load capacity than the 1mm variants at equivalent dimensions. For exact load and deflection data for a specific variant, please contact us to confirm. Do not exceed the solid height of the spring in service, as this can cause permanent set and reduce spring life.
The zinc galvanised coating provides meaningful corrosion resistance for indoor and mildly humid environments, significantly outperforming bare carbon steel springs. However, galvanised springs are not recommended for continuous immersion in water, exposure to strong acids or alkalis, or marine salt-spray environments. For those conditions, stainless steel springs would be a more appropriate choice.
Yes. The closed and ground ends provide a flat bearing surface that seats reliably against standard flat spring seats, plates, and machined pockets. The range of outer diameters (10mm–20mm) covers many common spring pocket sizes used in DIY hardware, light machinery, and prototype assemblies. Always verify the OD, ID, and free length against your specific application dimensions before ordering.
Packs of 5 are ideal for one-off repairs, prototyping, or testing a size before committing to a larger quantity. Packs of 10 suit small batch builds or keeping a working stock on hand. Packs of 30 offer the best per-unit value for production runs, maintenance kits, or workshop stock where you regularly use the same spring size. All pack sizes ship the same spring — only the quantity differs.
The galvanised coating offers improved weather resistance compared to plain steel, making these springs suitable for sheltered outdoor use — for example, inside an enclosure or cabinet that is exposed to ambient humidity but not direct rain or standing water. For fully exposed outdoor or marine environments, a stainless steel compression spring would provide better long-term corrosion resistance.
