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When your project demands consistent return force in a compact form factor, finding a spring that holds its shape under repeated cycling can be a real challenge. Engineers, makers, and DIY builders working on CNC machines, robotics, jigs, and mechanical assemblies need springs that won't fatigue or corrode over time — and that's exactly where these 304 stainless steel compression springs deliver.
Each spring in this listing is wound from 304-grade stainless steel wire with a diameter of 1mm (0.039 in). The outer diameter spans 11–12mm (approximately 0.43–0.47 in), and free lengths range from 10mm to 305mm (roughly 0.39 in to 12 in). Springs are available in both OD11mm and OD12mm series, covering a wide range of free lengths to suit varied stroke requirements.
Typical use cases include compression return mechanisms in 3D printer Z-axis assemblies, spring-loaded clamps and fixtures for woodworking or metalworking, valve and actuator return springs in pneumatic or hydraulic systems, and small-load suspension or damping elements in robotics and automation rigs.
Wound from 304-grade stainless steel wire for solid corrosion resistance in humid, mildly acidic, or outdoor environments — far more durable than carbon steel alternatives.
The 1mm wire gauge delivers a balanced spring rate suitable for light-to-medium load applications, offering consistent deflection without permanent set under normal operating conditions.
From compact 10mm springs for tight assemblies to 305mm (12-inch) lengths for longer-stroke mechanisms — one listing covers the full spectrum of your project needs.
Springs in this series typically feature closed ends for stable seating on flat surfaces, reducing lateral buckling and improving load alignment in guided applications.
Available in packs from 1 to 100 pieces per order, so you can stock exactly what your production run or repair job requires without over-ordering.
Suited for CNC machines, 3D printers, robotics, pneumatic valves, mechanical jigs, and general DIY automation projects requiring reliable elastic return force.
| Material | 304 Stainless Steel |
|---|---|
| Wire Diameter | 1mm (0.039 in) |
| Outer Diameter (OD) | 11mm or 12mm (0.43 in / 0.47 in) — see variant options |
| Free Length | 10mm – 305mm (0.39 in – 12.0 in) — see variant options |
| End Type | Closed ends (typical) |
| Spring Rate | See variant options |
| Surface Finish | Natural stainless (no coating) |
| Operating Temperature | -200°C to +300°C (typical for 304 SS) |
| Quantity per Pack | See variant options (1–100 pcs) |
Measure the distance between your spring seats when the mechanism is at rest (uncompressed). Select a free length that is longer than this distance by the amount of travel (stroke) you need. For example, if your seat gap is 20mm and you need 10mm of compression travel, choose a spring with a free length of at least 30mm.
The OD11mm series has an outer diameter of 11mm (≈0.43 in) and the OD12mm series has an outer diameter of 12mm (≈0.47 in). Both use the same 1mm wire diameter, so the OD12mm spring has a slightly larger coil body and may offer a marginally different spring rate at the same free length. Choose based on the bore or seat diameter in your assembly.
Yes. 304 stainless steel provides 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) — for those conditions, 316 stainless steel would be more appropriate.
The load capacity depends on the specific free length and OD variant selected. With a 1mm wire diameter, these springs are designed for light-to-medium loads. For precise load calculations, use the spring rate (N/mm) and your required deflection. If you need exact spring rate data for a specific variant, please contact us to confirm.
Yes, these are commonly used in 3D printer bed leveling systems, Z-axis return mechanisms, and CNC fixture clamps. The 1mm wire diameter and stainless steel construction provide consistent return force and resist the heat and vibration typical in these environments.
For prototyping or single-unit repairs, packs of 1–5 pieces are ideal. For small production runs or stocking a workshop, packs of 10–50 pieces offer better value per unit. Bulk packs of 100 pieces are suited for production environments or resellers. Select your SIZE and QTY combination from the variant dropdowns above.
The format stands for: CS = Coil/Wire diameter (1mm), OD = Outer Diameter (11mm or 12mm), L = Free Length in mm. For example, "1x11x20mm" means wire diameter 1mm, outer diameter 11mm, free length 20mm.
