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Finding a compression spring that fits your exact bore, shaft, or housing without guesswork is a recurring frustration for engineers, makers, and repair technicians. These A2 stainless steel compression springs are sold in packs of 10, giving you spares on hand for prototyping, maintenance kits, or small-batch production runs where consistency matters.
Each spring is formed from A2 (304) stainless steel wire. Wire diameters span 0.2 mm, 0.25 mm, 0.3 mm, and 0.4 mm (approximately 0.008"–0.016"); outer diameters range from 2 mm to 10 mm (approximately 0.08"–0.39"); free lengths run from 5 mm to 50 mm (approximately 0.20"–1.97"). End style is closed and ground on larger sizes; open ends on the finer wire variants — see variant options for exact end configuration.
Typical applications include electronic device actuators requiring a 2–3 mm OD return spring, precision instrument assemblies needing a 0.2 mm wire compression element, and light-duty mechanical linkages or valve mechanisms where a 5–50 mm free-length stainless spring resists corrosion in humid or mildly acidic environments.
Resists oxidation and mild corrosion, making these compression springs suitable for humid, outdoor, or lightly chemical-exposed environments without surface treatment.
Wire diameters from 0.2 mm to 0.4 mm, outer diameters from 2 mm to 10 mm, and free lengths from 5 mm to 50 mm — covering a broad range of miniature and light-duty metric spring applications.
Each listing ships 10 identical springs, ideal for prototyping batches, repair kits, or keeping matched spares without ordering in bulk reels.
Uniform coil spacing ensures predictable spring rate and deflection behavior across the pack, reducing variability in assemblies that depend on repeatable elastic return force.
Fine wire diameters starting at 0.2 mm are suited to compact electronic actuators, pen mechanisms, medical device prototypes, and other applications where space is constrained.
All dimensions are specified in millimeters for direct compatibility with metric engineering drawings, CAD models, and standard metric fastener and bore sizing.
| Material | A2 Stainless Steel (304) |
|---|---|
| Wire Diameter | 0.2 mm / 0.25 mm / 0.3 mm / 0.4 mm (see variant options) |
| Outer Diameter | 2 mm – 10 mm (see variant options) |
| Free Length | 5 mm – 50 mm (see variant options) |
| Spring Type | Compression |
| End Type | See variant options |
| Coil Direction | Right-hand (standard) |
| Surface Finish | Bright / natural stainless |
| Quantity per Pack | 10 pieces |
| Spring Rate | See variant options |
| OD Tolerance | Typically ±0.05–0.10 mm |
| Operating Temperature | Typically –20°C to +200°C (A2 stainless) |
Wire diameter determines the spring rate and load capacity. Thinner wire (0.2 mm–0.25 mm) produces lighter, more flexible springs suited to low-force applications such as electronic actuators or pen mechanisms. Thicker wire (0.3 mm–0.4 mm) provides greater resistance and is better for mechanical linkages or valve returns. Match wire diameter to your required load and deflection using a spring rate calculation or consult your engineering drawing.
The outer diameter (OD) listed is the nominal outside coil dimension. The inner diameter (ID) is approximately OD minus twice the wire diameter. If your spring sits inside a bore, the OD must be smaller than the bore with clearance. If it fits over a shaft, the ID must be larger than the shaft OD. Use the wire diameter and OD values in the variant selector to calculate the ID for your specific size.
A2 stainless steel offers good fatigue resistance for light-duty cycling applications. For high-cycle or high-stress applications, the spring should be operated within 80% of its solid height deflection limit. If your application involves millions of cycles under significant load, contact us to confirm suitability or consider a higher-grade spring steel option.
A2 (304) stainless steel provides good resistance to atmospheric corrosion, fresh water, and mild chemical exposure. It is not recommended for prolonged immersion in salt water or strong acids. For marine or highly corrosive environments, A4 (316) stainless steel springs would be more appropriate. For typical indoor, humid, or light outdoor use, A2 stainless performs reliably without additional coating.
Yes — all dimensions are specified in metric millimeters, making them directly compatible with metric engineering designs. Verify the outer diameter fits your bore with adequate clearance (typically 0.1–0.3 mm) and that the free length suits your assembly's travel range. The variant selector lets you choose the exact wire diameter, outer diameter, and free length combination you need.
Free length is the uncompressed length of the spring. Your required free length should equal the installed length plus the desired preload deflection. For example, if your housing is 20 mm deep and you want 5 mm of preload compression, select a 25 mm free length spring. Available lengths range from 5 mm to 50 mm in this listing — choose the variant that matches your assembly geometry.
Buying in packs of 10 ensures you have matched spares for repairs, prototyping iterations, or small production runs without the cost of bulk reels. Springs can be lost, damaged during installation, or needed in multiples within a single assembly. Having extras on hand avoids project delays waiting for reorders.
