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When a flimsy spring causes your mechanism to fail mid-project, the frustration is real. Whether you are a hobbyist building custom gadgets, a maker prototyping mechanical assemblies, or a technician repairing small appliances, you need a compression spring that delivers consistent return force without corroding or fatiguing prematurely. These A2 stainless steel compression springs are engineered for exactly that demand.
Each pack contains 10 identical compression springs manufactured from A2 (304) stainless steel wire. Wire diameter options span 0.8 mm (approx. 0.031 in) and 1.0 mm (approx. 0.039 in). Outer diameter ranges from 5 mm to 16 mm (approx. 0.20 in to 0.63 in), and free length ranges from 10 mm to 50 mm (approx. 0.39 in to 1.97 in), giving you a broad selection matrix to match your exact specification.
Typical use cases include spring-loaded pen mechanisms and clicker assemblies, valve and plunger return systems in small pneumatic or hydraulic circuits, and precision jig fixtures requiring repeatable compression force in electronics or watchmaking benches.
Made from A2 (304) stainless steel wire, offering solid corrosion resistance in humid, mildly acidic, and outdoor environments without surface treatment.
Wire dia 0.8 mm or 1.0 mm, OD 5–16 mm, free length 10–50 mm — 169 combinations available so you can match the exact spring rate and travel your design requires.
Cold-wound to tight dimensional tolerances, these springs maintain repeatable spring rate across the full compression stroke, reducing mechanism variability in precision assemblies.
Each order ships 10 identical springs, giving you spares for prototyping iterations, replacements, or multi-position assemblies without ordering multiple SKUs.
End style is typically closed and ground for flat seating, ensuring stable load transfer and square alignment in spring pockets and plunger bores.
Compact sizing and metric dimensions make these springs straightforward to integrate into 3D-printed housings, CNC-machined fixtures, and off-the-shelf hardware assemblies.
| Material | A2 (304) Stainless Steel |
|---|---|
| Wire Diameter | 0.8 mm / 1.0 mm (see variant options) |
| Outer Diameter (OD) | 5 mm – 16 mm (see variant options) |
| Free Length | 10 mm – 50 mm (see variant options) |
| Spring Type | Compression |
| End Style | Closed & Ground (typical) |
| Finish | Natural / Bright (no coating) |
| Spring Rate | See variant options |
| Quantity per Pack | 10 Pieces |
| Standard | Metric |
Measure the bore or housing that will guide the spring. The spring OD should be 0.5–1.5 mm smaller than the bore diameter to allow free movement without binding. For a plunger rod, the spring ID (OD minus twice the wire diameter) should clear the rod with at least 0.3 mm of radial clearance.
A thicker wire diameter (1.0 mm) produces a stiffer spring with a higher spring rate for the same OD and free length. Choose 0.8 mm wire for lighter loads and more travel, and 1.0 mm wire when you need greater return force or resistance to solid-height compression under load.
A2 (304) stainless steel provides good corrosion resistance in most atmospheric, freshwater, and mildly acidic conditions. It is not recommended for prolonged exposure to chloride-rich environments such as seawater or de-icing salts, where A4 (316) stainless steel would be a better choice.
These springs are well-suited for pen and clicker mechanisms, valve return systems, spring-loaded latches, electronics jig fixtures, watchmaking and instrument repair, 3D-printer extruder tensioners, and general DIY mechanical assemblies requiring a compact metric compression spring.
Yes. Design your spring pocket with an inner diameter 0.5–1.0 mm larger than the spring OD to account for FDM print tolerances. Ensure the pocket depth is at least equal to the spring free length to allow full extension, and add a flat seating surface for the closed ground end.
Spring rate (k) = Gd⁴ / (8D³n), where G is the shear modulus (~75 GPa for stainless steel), d is wire diameter, D is mean coil diameter (OD minus wire diameter), and n is the number of active coils. If you need a specific spring rate, contact us with your load and travel requirements and we can help identify the best variant.
Springs are small and easy to lose during assembly. Having 10 identical pieces means you have spares for prototyping iterations, multi-position mechanisms, or future repairs without waiting for a reorder. The per-unit cost is also lower in a pack compared to sourcing singles.
