Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.
When a project demands consistent return force and long-term dimensional stability, finding the right compression spring in the exact wire diameter and free length can be a real challenge. Whether you are a hobbyist assembling a custom mechanism, a maker prototyping a device, or a technician maintaining light industrial equipment, these 304 stainless steel compression springs give you the precise sizing you need without over-engineering your budget.
Each pack contains 10 identical compression springs wound from 304-grade stainless steel wire. Wire diameters span 0.5 mm, 0.6 mm, and 0.7 mm (approximately 0.020–0.028 in); outer diameters range from 3 mm to 12 mm (approx. 0.12–0.47 in); free lengths run from 5 mm to 50 mm (approx. 0.20–1.97 in). Select your exact combination from the variant options above.
Typical applications include electronic button return mechanisms, pen and stylus click assemblies, small valve and check-valve systems, model engineering and robotics joints, and light-duty latch or lock return springs — all scenarios where a compact, corrosion-resistant compression spring for DIY projects is essential.
| Material | 304 Stainless Steel |
|---|---|
| Wire Diameter | 0.5 mm / 0.6 mm / 0.7 mm (see variant options) |
| Outer Diameter (OD) | 3 mm – 12 mm (see variant options) |
| Free Length | 5 mm – 50 mm (see variant options) |
| Quantity per Pack | 10 pieces |
| End Type | Closed ends (typically ground) |
| Coil Direction | Right-hand wound |
| Spring Rate | See variant options |
| Surface Finish | Bright / natural stainless |
| Weight (per pack) | See variant options |
Wire diameter determines the spring's stiffness and load capacity. A thicker wire (0.7 mm) produces a stiffer spring with higher load capacity, while a thinner wire (0.5 mm) gives a softer, more compliant response. Match the wire diameter to the force range your mechanism requires. If you are unsure, start with 0.6 mm as a mid-range option and test deflection under your expected load.
Wire diameter is the thickness of the steel wire used to wind the spring. Outer diameter (OD) is the overall width of the coiled spring body. When fitting a spring inside a bore or housing, the OD must be smaller than the bore. When fitting a spring over a shaft or pin, the inner diameter (ID = OD minus 2× wire diameter) must be larger than the shaft.
Yes. 304 stainless steel offers good resistance to atmospheric corrosion, moisture, and mild chemical exposure. It is suitable for outdoor DIY projects, bathroom or kitchen mechanisms, and light marine environments. For highly aggressive salt-spray or chemical environments, 316 stainless steel would be a stronger choice.
These springs are compatible with a wide range of light-duty applications: pen and stylus click mechanisms, electronic push-button returns, small pneumatic or hydraulic check valves, model engineering assemblies, robotics joints, door latches, and hobby or maker projects. Always verify that the OD, ID, and free length match your housing dimensions before installation.
Use Hooke's Law: F = k × x, where F is the applied force (N), k is the spring rate (N/mm), and x is the deflection (mm). The spring rate depends on wire diameter, coil diameter, number of active coils, and material modulus. Because exact spring rates vary by variant, contact us with your specific variant dimensions and we can provide guidance on expected deflection ranges.
Yes. Springs stacked in series (end-to-end) produce a softer combined rate and greater total deflection. Springs arranged in parallel (side-by-side) produce a stiffer combined rate. Since each pack contains 10 identical springs, you have enough units to experiment with both configurations in your prototype before committing to a final design.
As a conservative guideline, compression springs should not be compressed beyond approximately 70–80% of their free length in continuous-duty applications to avoid set (permanent deformation). For intermittent or low-cycle use, up to 85% may be acceptable. Exact solid height and maximum safe travel depend on the specific variant's coil count and wire diameter — contact us to confirm for your chosen size.
