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When a loose hinge, a sticking valve, or a worn-out mechanism brings your project to a halt, having the right compression spring on hand makes all the difference. These small compression springs are designed for hobbyists, engineers, and repair technicians who need precise elastic force in compact spaces — without sourcing custom parts.
Each spring is formed from round steel wire with diameters ranging from 0.5 mm to 1.5 mm (0.020"–0.059"), outer diameters spanning 3 mm to 25 mm (0.12"–0.98"), and free lengths from 5 mm to 50 mm (0.20"–1.97"). Springs are sold in packs of 10 pieces per variant. Material finish is a natural steel tone; surface treatment varies by wire gauge — see variant options for confirmed coating details.
Typical use cases include small compression springs for electronics enclosures and battery contacts, miniature return springs in door latches and cabinet hardware, and precision pressure springs for DIY mechanical assemblies, pen mechanisms, and hobby robotics.
| Wire Diameter | 0.5 mm / 0.8 mm / 1 mm / 1.5 mm (0.020"–0.059") |
|---|---|
| Outer Diameter (OD) | 3 mm – 25 mm (0.12"–0.98") — See variant options |
| Free Length | 5 mm – 50 mm (0.20"–1.97") — See variant options |
| Quantity per Pack | 10 pieces |
| Material | Steel wire |
| Surface Finish | See variant options |
| Spring Type | Compression (open coil, axial load) |
| Coil Direction | See variant options |
| Spring Rate | See variant options |
| End Type | See variant options |
Measure the inner bore or housing where the spring will sit. The spring's outer diameter should be slightly smaller than the bore — typically 0.2 mm to 0.5 mm clearance — so it compresses freely without binding. Use the variant selector above to pick the OD closest to your requirement.
A thicker wire diameter produces a stiffer spring with a higher spring rate. For light-duty applications such as pen mechanisms or battery contacts, 0.5 mm or 0.8 mm wire is typically sufficient. For moderate mechanical loads in latches or valves, 1 mm or 1.5 mm wire provides greater resistance to compression.
These springs are formed from steel wire. Steel springs can be susceptible to surface oxidation in high-humidity or wet environments without additional protection. For outdoor or corrosive environments, consider applying a light coat of machine oil or selecting a stainless steel spring variant if available. Contact us to confirm surface treatment details for your chosen variant.
Yes. The smaller wire gauges (0.5 mm and 0.8 mm) with outer diameters of 3 mm to 8 mm are commonly used in battery contacts, push-button mechanisms, and PCB-mounted spring contacts. Ensure the spring's free length and compressed length match your assembly's travel distance.
The free length listed in the variant name (e.g., "20mm") is the uncompressed length of the spring. Your assembly's available travel should be less than the free length. The solid height (fully compressed) depends on the number of coils and wire diameter — contact us if you need solid-height confirmation for a specific variant.
Yes. Each pack contains 10 springs of the same wire diameter, outer diameter, and free length as specified in the variant. They are manufactured to consistent coil pitch for uniform performance across the pack, making them suitable for applications requiring matched spring sets.
A compression spring resists being pushed together — it pushes back when compressed. An extension spring resists being pulled apart — it pulls back when stretched. These listings are compression springs with open coils designed to absorb and store energy under axial compressive load.
