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When a worn-out spring causes a mechanism to fail — a sticking valve, a sluggish latch, a rattling assembly — finding the exact replacement size is the real challenge. These compression springs are designed for engineers, technicians, and hands-on DIYers who need a precise fit without ordering custom parts. Available in wire diameters from 0.3mm to 6.0mm and outer diameters from 3mm to 60mm, this range covers the vast majority of light-to-medium duty spring replacement needs.
Each spring is formed from carbon steel wire with a consistent helical coil structure. Wire diameters span 0.3mm–6.0mm (0.012"–0.236"), outer diameters range from 3mm–60mm (0.118"–2.362"), and body lengths are typically 190mm–400mm (7.5"–15.7") depending on the selected variant. The spring ends are closed and ground for stable seating on flat surfaces.
Typical use cases include mechanical equipment maintenance (replacing actuator return springs), electronics and appliance repair (battery contact springs, button return springs), and light industrial assembly (jig fixtures, clamp mechanisms, and tensioning devices). Long-tail search terms that describe this product: small compression spring replacement, metric compression spring assortment, steel coil spring for DIY repair.
| Spring Type | Compression (helical coil) |
|---|---|
| Material | Carbon steel wire |
| Wire Diameter Range | 0.3mm – 6.0mm (0.012" – 0.236") |
| Outer Diameter Range | 3mm – 60mm (0.118" – 2.362") |
| Free Length Range | 190mm – 400mm (7.5" – 15.7") depending on variant |
| End Type | Closed and ground |
| Coil Direction | Right-hand (standard) |
| Surface Finish | See variant options |
| Spring Rate | See variant options |
| Load Capacity | See variant options |
| Quantity per Order | 1 Pc / 2 Pcs / 3 Pcs (select above) |
Measure the existing spring with a caliper: record the wire thickness (wire diameter), the full outside width of the coil (outer diameter), and the uncompressed length (free length). Match all three dimensions to the variant label shown as Wire Dia × OD × Length. If you are designing from scratch, the wire-to-OD ratio affects stiffness — a thicker wire relative to OD produces a stiffer spring.
Spring rate depends on the specific wire diameter, outer diameter, number of active coils, and material modulus. Because this listing covers a wide range of sizes, the spring rate varies by variant. For precise load requirements, contact us with your wire dia, OD, and free length and we can provide further guidance. As a general reference, smaller wire diameters (0.3–0.8mm) are suited for light instrument or electronic applications, while larger diameters (3–6mm) handle heavier mechanical loads.
These springs are made from carbon steel, which offers good mechanical strength but limited inherent corrosion resistance. For outdoor, humid, or wet environments, we recommend applying a light coat of grease or oil after installation, or selecting a stainless steel alternative if long-term corrosion resistance is critical. Indoor mechanical and electronic applications are well within the intended use range.
Closed ends means the last coil is wound tightly against the adjacent coil with no gap, creating a flat contact surface. Ground ends means that flat surface is machined smooth. Together, these features ensure the spring sits squarely on its seat without tilting, which improves load alignment and reduces side-loading stress on the spring body — important for consistent performance in guided spring applications.
Yes. The smaller wire diameter variants (0.3mm–1.0mm) with compact outer diameters (3mm–10mm) are commonly used in battery contacts, push-button return mechanisms, and PCB-mounted spring contacts. Ensure the free length and compressed length fit within your housing dimensions, and verify the spring rate is appropriate for the contact force required by your design.
Order 1 Pc for a direct single-unit replacement or to test fit before committing to a larger quantity. Order 2 or 3 Pcs if you are repairing multiple units simultaneously, want a spare on hand, or are prototyping a design that may require iteration. The per-piece price is consistent across pack sizes in this listing.
The free length (305mm, 300mm, 400mm, or 190mm depending on the specific variant) is the uncompressed body length of the spring. A longer free length provides more total deflection travel before the spring reaches solid height. Select the length that matches your application's required stroke plus any preload compression. If you are replacing an existing spring, match the free length of the original part.
