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When a repair stalls because you cannot find a spring that matches the exact wire gauge, free length, and outer diameter you need, the project sits idle. Engineers, hobbyists, and repair technicians who work with small mechanisms — clocks, valves, pens, electronics enclosures, and light machinery — need a reliable source of accurately sized compression springs in a range of configurations.
These compression springs are wound from carbon steel wire in diameters of 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, and 1 mm (approximately 0.024–0.039 in). Outer diameters span 5–16 mm (approx. 0.20–0.63 in) and free lengths range from 10–100 mm (approx. 0.39–3.94 in). Each listing is sold in packs of 5 or 10 pieces depending on the variant selected.
Typical applications include compression spring replacement for small appliances and consumer electronics, return-spring assemblies in jigs and fixtures, prototype spring selection for mechanical engineering projects, and light-load valve or plunger mechanisms in pneumatic or hydraulic hobby builds.
| Spring Type | Compression (helical coil) |
|---|---|
| Wire Diameter Range | 0.6 mm / 0.7 mm / 0.8 mm / 0.9 mm / 1 mm |
| Outer Diameter Range | 5 mm – 16 mm (approx. 0.20 – 0.63 in) |
| Free Length Range | 10 mm – 100 mm (approx. 0.39 – 3.94 in) |
| Material | Carbon steel |
| Surface Finish | See variant options |
| End Type | See variant options |
| Spring Rate | See variant options |
| Pack Quantity | 5 pcs or 10 pcs (see variant options) |
| Load Direction | Axial compression |
Measure three key dimensions on the spring you are replacing or the cavity it must fit: the outer diameter (OD), the free length (uncompressed length), and the wire diameter. Match these to the variant options — Wire diameter(mm), Length, and Diameter & Qty(pcs). If you are designing from scratch, also estimate the load you need the spring to exert at a given compressed height to select an appropriate wire gauge.
The pack quantity is shown in the "Diameter & Qty(pcs)" option (e.g., "7mm & 5 pcs" or "7mm & 10 pcs"). The 5-piece packs are well suited for prototyping or single-unit repairs, while the 10-piece packs offer better value when you need spares or are building multiple units.
These springs are designed for light-to-medium load applications such as small appliances, electronics, hobby mechanisms, jigs, and fixtures. For heavy industrial or safety-critical applications, please verify the spring rate and load capacity against your engineering requirements before use. Contact us to confirm specifications if needed.
These springs are made from carbon steel. Carbon steel offers good mechanical properties for dry or low-humidity indoor environments. For applications exposed to moisture, chemicals, or outdoor conditions, consider using a protective coating or selecting stainless steel springs instead. Surface finish details vary by variant — contact us to confirm.
Yes. The smaller wire diameter variants (0.6 mm – 0.8 mm) with outer diameters of 5–9 mm are commonly used in pens, battery contacts, keyboard switches, small valves, and precision instrument mechanisms. Verify the free length and OD against your housing dimensions before ordering.
Wire diameter directly affects spring stiffness (spring rate). A thicker wire (e.g., 1 mm) produces a stiffer spring that resists compression more strongly, while a thinner wire (e.g., 0.6 mm) produces a softer spring. If you are replacing an existing spring, measure the wire with calipers. If designing new, use your required load and deflection to calculate the needed wire gauge.
We recommend double-checking all three dimensions (wire diameter, outer diameter, and free length) before placing your order. If you receive an incorrect item due to a fulfillment error, please contact us and we will resolve it promptly. For sizing questions before purchase, feel free to reach out via our contact page.
