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When a mechanism fails because a tiny spring loses its tension or corrodes, the whole assembly stops. Engineers, hobbyists, and repair technicians who work with compact actuators, pen mechanisms, valve assemblies, and precision instruments need compression springs that hold their rated load cycle after cycle without rust or fatigue. These stainless steel compression springs are engineered for exactly that demand.
Each spring is cold-wound from stainless steel wire in diameters of 0.7 mm, 0.8 mm, and 1.0 mm (approx. 0.028"–0.039"). Outer diameters span 6–14 mm (approx. 0.24"–0.55"), and free lengths range from 5 mm to 305 mm (approx. 0.20"–12.0"). Packing quantities are 1, 5, or 10 pieces per order depending on the selected variant.
Typical use cases include: replacing worn return springs in ballpoint pens and mechanical pencils; providing preload in miniature solenoid valves and pneumatic fittings; acting as cushion elements in 3D-printer extruder assemblies and CNC probe mechanisms; and serving as tension-reset components in small electronics enclosures and switch housings.
| Material | Stainless Steel |
|---|---|
| Wire Diameter | 0.7 mm / 0.8 mm / 1.0 mm |
| Outer Diameter (OD) | 6 mm – 14 mm (see variant options) |
| Free Length | 5 mm – 305 mm (see variant options) |
| Spring Type | Compression |
| End Type | See variant options |
| Surface Finish | Natural stainless (no coating) |
| Spring Rate | See variant options |
| Max Load | See variant options |
| Packing Quantity | 1 / 5 / 10 PCS (see variant options) |
| Operating Temperature | Typically –20°C to +200°C (–4°F to +392°F) |
Wire diameter determines the spring's stiffness and load capacity. A thicker wire (1.0 mm) produces a stiffer spring with higher load capacity, while a thinner wire (0.7 mm) yields a softer spring suited to lighter preload applications. Match the wire diameter to your required spring rate and the available bore/seat dimensions in your assembly.
The outer diameter of the spring should be slightly smaller than the inner diameter of the bore or housing it sits in — typically 0.5–1.0 mm of clearance is recommended to allow free compression without binding. For guided-rod applications, the inner diameter of the spring (OD minus 2× wire diameter) should be slightly larger than the rod diameter.
Yes. Stainless steel provides good resistance to atmospheric moisture, fresh water, and mild chemical exposure. For marine environments or strong acid/alkali exposure, additional evaluation is recommended. These springs do not require painting or plating to maintain their surface integrity under normal conditions.
Free length is the spring's natural, unloaded length as listed in the variant options. Compressed length (solid height) is the minimum length when all coils are fully closed. Your working stroke must fit between the free length and the solid height. If you need a specific compressed length, contact us to confirm before ordering.
The cold-winding process improves fatigue resistance, making these springs suitable for moderate-to-high cycle counts in typical mechanical applications such as switches, valves, and actuators. For extreme-duty applications (millions of cycles under high stress), consult a spring engineer to verify the stress ratio against the material's endurance limit.
The variants listed cover a broad size matrix. If you need a size combination not shown, or quantities larger than the listed packs, please contact us via the store's contact page and we will advise on availability or sourcing options.
Measure your existing spring's wire diameter, outer diameter, and free length with calipers. Then match those measurements to the variant options in the dropdown menus above. If you are replacing a spring without a sample, check your assembly's engineering drawing or manufacturer specification sheet for the spring's nominal dimensions.
