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When a mechanism fails to return to position, or a valve chatters under load, the culprit is often an undersized or corroded spring. Engineers, hobbyists, and repair technicians who need a dependable compression spring in a compact diameter will find this series purpose-built for tight-clearance applications where consistent spring force and corrosion resistance are non-negotiable.
Each spring is formed from 304 stainless steel wire with a nominal diameter of 1.2 mm. The outer diameter spans 10–11 mm (approximately 0.39–0.43 in), and free lengths range from 10 mm to 200 mm (roughly 0.39 in to 7.87 in), covering a wide spectrum of travel requirements. Ends are closed and ground for flat seating and stable load distribution.
Typical use cases include electronic enclosure latches and push-button return mechanisms, fluid-control valves and check-valve assemblies requiring corrosion-resistant compression springs, and DIY robotics or 3D-printer extruder tensioners where a small-OD stainless steel compression spring with precise free length is essential.
Resists oxidation, mild acids, and humid environments — suitable for indoor and light outdoor applications without surface treatment.
A single product family covers short-travel detent springs through long-stroke return springs, reducing the need for multiple SKUs in your inventory.
Uniform 1.2 mm wire diameter across all variants ensures predictable spring rate and fatigue life within the same coil geometry.
Flat-ground ends provide stable seating on spring pockets and retainers, minimizing lateral deflection under axial load.
Available from 2-piece sample packs to 100-piece bulk orders — scale your purchase to prototyping needs or production runs without overstocking.
304 stainless steel maintains mechanical properties in damp or mildly corrosive environments where carbon steel springs would degrade prematurely.
| Material | 304 Stainless Steel |
|---|---|
| Wire Diameter (CS) | 1.2 mm (0.047 in) |
| Outer Diameter (OD) | 10 mm or 11 mm (0.39 in / 0.43 in) — see variant options |
| Free Length (L) | 10–200 mm (0.39–7.87 in) — see variant options |
| End Type | Closed and Ground |
| Coil Direction | Right-hand (typical for this wire size) |
| Spring Rate | See variant options |
| Surface Finish | Natural (uncoated stainless) |
| Operating Temperature | Typically –20°C to +200°C (–4°F to +392°F) |
| Quantity per Pack | See variant options (2 – 100 pcs) |
Measure the distance between the two spring seats when the mechanism is at rest (unloaded). Select a free length that is longer than this distance by the amount of preload travel you need. For example, if your seat gap is 20 mm and you want 5 mm of preload, choose a free length of approximately 25 mm. Always confirm the compressed length does not exceed the solid height of the spring.
Both share the same 1.2 mm wire diameter, so the spring rate per unit length is similar. The 10 mm OD variant fits tighter bores (minimum bore approximately 11 mm) and smaller guide rods (maximum rod approximately 8 mm). The 11 mm OD variant requires a slightly larger bore (minimum approximately 12 mm) and suits guide rods up to approximately 9 mm. Choose based on the bore or rod diameter in your assembly.
304 stainless steel compression springs in this wire diameter are well-suited for light-to-medium duty applications such as electronics, instrumentation, valves, and consumer products. For heavy industrial presses or very high-cycle fatigue environments (millions of cycles), consider springs made from 17-7 PH stainless or music wire with a higher tensile strength. Contact us if you need specific load or cycle-life data.
304 stainless steel offers good resistance to atmospheric corrosion, fresh water, and mild chemical exposure. It is not recommended for prolonged immersion in chloride-rich environments (e.g., seawater or salt spray) without additional protection. For marine or highly corrosive environments, 316 stainless steel springs would be a more appropriate choice.
As a general rule: the guide rod OD should be no more than 75–80% of the spring's inner diameter (ID = OD minus 2× wire diameter). For the 10 mm OD spring: ID ≈ 10 − 2(1.2) = 7.6 mm, so maximum rod ≈ 6–7 mm. For the 11 mm OD spring: ID ≈ 11 − 2(1.2) = 8.6 mm, so maximum rod ≈ 7–8 mm. The bore should be at least 0.5–1 mm larger than the spring OD to allow free movement.
Yes. Many size variants are available in packs as small as 2 or 4 pieces, making it easy to prototype and validate fit and function before placing a larger order. Simply select the desired SIZE and the smallest QTY option from the variant dropdowns above.
The format stands for: CS = wire (coil) diameter, OD = outer diameter of the spring coil, L = free length. All dimensions are in millimeters. For example, "1.2x10x25mm" means a spring with 1.2 mm wire diameter, 10 mm outer diameter, and 25 mm free length.
