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When a worn-out spring causes a mechanism to fail — whether in a household appliance, a small tool, or a precision instrument — finding an exact replacement in the right wire diameter and free length is the real challenge. These compression springs are designed for hobbyists, makers, engineers, and repair technicians who need reliable, dimensionally consistent springs without ordering in bulk.
Each set contains 10 pieces of compression springs made from carbon spring steel wire. Wire diameters available are 0.8mm (~0.031 in) and 0.9mm (~0.035 in), with outer diameters ranging from 5mm to 14mm (~0.197–0.551 in) and free lengths from 10mm to 50mm (~0.394–1.969 in). The coil ends are closed and ground for stable seating on flat surfaces.
These compression springs are well-suited for DIY appliance repair (replacing springs in switches, latches, and valves), small mechanical assemblies such as pen mechanisms and clamps, electronics enclosures and battery contacts, and light-load industrial or hobby robotics applications requiring consistent return force.
Made from carbon spring steel wire, offering consistent elastic return and resistance to deformation under repeated compression cycles.
Wire diameters of 0.8mm and 0.9mm; outer diameters from 5mm to 14mm; free lengths from 10mm to 50mm — covering a broad range of replacement and design needs.
Both ends are closed and ground flat, providing stable, perpendicular seating and reducing lateral deflection during compression.
Uniform coil pitch and wire diameter across each batch ensures repeatable spring rate and predictable load-deflection behavior.
Each order includes 10 identical springs, giving you spares for prototyping, testing, or multi-unit repairs without overstocking.
Suitable for appliance repair, electronics, hobby robotics, pen mechanisms, valve assemblies, and light-load mechanical linkages.
| Wire Diameter | 0.8mm (~0.031 in) or 0.9mm (~0.035 in) — see variant options |
|---|---|
| Outer Diameter (OD) | 5mm – 14mm (~0.197 – 0.551 in) — see variant options |
| Free Length | 10mm – 50mm (~0.394 – 1.969 in) — see variant options |
| Material | Carbon spring steel |
| End Type | Closed and ground |
| Coil Direction | Right-hand |
| Surface Finish | Bare steel (uncoated) |
| Quantity per Pack | 10 pieces |
| Spring Rate | See variant options |
| Load Capacity | See variant options |
Match three dimensions to your application: wire diameter (0.8mm or 0.9mm), outer diameter (OD), and free length. The OD must fit inside the bore or housing with a small clearance (typically 0.5–1mm). The free length should be longer than your required compressed length to ensure adequate spring force. If replacing an existing spring, measure the original with calipers before ordering.
A thicker wire diameter (0.9mm vs 0.8mm) produces a stiffer spring with a higher spring rate for the same OD and length. If you need more return force or resistance to compression, choose 0.9mm wire. For lighter-load applications such as pen mechanisms or small latches, 0.8mm wire is typically sufficient.
These springs are made from bare carbon spring steel without a protective coating. They are suitable for dry indoor environments. For applications involving moisture, humidity, or mild chemicals, consider applying a light machine oil or grease to the spring surface to slow oxidation. For fully corrosion-resistant applications, stainless steel springs would be more appropriate.
These springs are compatible with a wide range of light-duty applications including: household appliance repair (switches, latches, door mechanisms), electronics (battery contacts, PCB assemblies), hobby robotics and automation, pen and writing instrument mechanisms, valve and fluid control assemblies, and general DIY mechanical projects requiring a compact return spring.
"Closed ends" means the last coil is wound tightly against the adjacent coil, creating a flat contact surface. "Ground" means that flat surface has been machined smooth and perpendicular to the spring axis. This ensures the spring sits squarely on its seat, reducing lateral (sideways) deflection and improving load distribution — important for precision assemblies and consistent performance.
These springs are uncoated carbon steel and are not recommended for prolonged outdoor or wet exposure without protection. If used in a partially exposed environment, apply a corrosion-inhibiting oil or grease. For fully outdoor or marine applications, stainless steel compression springs are a more durable choice.
Measure the inner diameter of the bore or housing where the spring will sit. The spring's outer diameter (OD) should be approximately 0.5–1mm smaller than the bore ID to allow free movement without binding. Also verify that the spring's free length is appropriate — it should be longer than the compressed (working) length to maintain spring force throughout the stroke.
