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When your CNC build, robotics project, or mechanical assembly demands consistent return force without corrosion risk, undersized or mismatched springs cause costly rework and downtime. Engineers, makers, and DIY enthusiasts who need dimensionally accurate compression springs can rely on this stainless steel pressure spring series to deliver repeatable performance across a wide range of load requirements.
Each spring is formed from stainless steel wire with diameters ranging from 0.3 mm to 1.2 mm (approx. 0.012–0.047 in), outside diameters from 3 mm to 20 mm (approx. 0.12–0.79 in), and free lengths of 120 mm, 150 mm, 180 mm, or 200 mm (approx. 4.7–7.9 in). The helical coil geometry provides uniform pitch and consistent spring rate across the full compression stroke.
Typical use cases include compression spring for CNC router Z-axis return, small compression spring for 3D printer extruder tensioner, stainless steel coil spring for robotics joint preload, and long compression spring for jig and fixture clamping mechanisms.
Wire diameters 0.3–1.2 mm × outside diameters 3–20 mm × lengths 120–200 mm — one listing covers 140+ size combinations so you can match exact bore and shaft specs without custom orders.
Formed from stainless steel wire for inherent oxidation resistance, making these springs suitable for humid environments, light wash-down areas, and outdoor enclosures where carbon steel would corrode.
Uniform pitch and closed ends deliver a predictable spring rate and stable seating, reducing lateral buckling risk during compression — critical for precision jigs and sensor-return mechanisms.
Free lengths from 120 mm to 200 mm provide generous working travel, accommodating assemblies that require significant deflection before reaching solid height — ideal for clamping and tensioning applications.
Helical coil design stores and releases energy consistently across repeated cycles, maintaining dimensional accuracy in automated feed systems, valve actuators, and spring-loaded latches.
Compact packaging and per-piece availability make it easy to stock multiple sizes for rapid prototyping, repair, or replacement without committing to bulk industrial quantities.
| Material | Stainless steel wire |
|---|---|
| Wire Diameter Range | 0.3 mm – 1.2 mm (0.012 – 0.047 in) |
| Outside Diameter Range | 3 mm – 20 mm (0.12 – 0.79 in) |
| Free Length Options | 120 mm / 150 mm / 180 mm / 200 mm |
| Spring Type | Helical compression (closed ends) |
| Spring Rate | See variant options |
| Surface Finish | Natural stainless (no coating) |
| Corrosion Resistance | Suitable for humid and light outdoor environments |
| Load Direction | Axial compression |
| Solid Height | See variant options |
| Number of Coils | See variant options |
Start with the bore diameter of your housing or the shaft diameter your spring will slide over. The outside diameter of the spring should be slightly smaller than the bore (typically 0.2–0.5 mm clearance) or slightly larger than the shaft. Wire diameter determines stiffness — thicker wire produces a stiffer spring with higher load capacity. If you need a softer return force, choose a thinner wire diameter with the same outside diameter.
Select a free length that is longer than your required working length by at least the deflection distance you need. For example, if your assembly compresses the spring by 30 mm and you need 90 mm of working length, choose a free length of at least 120 mm. Longer free lengths provide more stroke but may require a guide rod to prevent buckling under load.
Spring load capacity depends on wire diameter, outside diameter, number of coils, and material. Thicker wire diameters (e.g., 1.0–1.2 mm) with smaller outside diameters produce higher spring rates and load capacity. For light-duty applications such as sensor returns or 3D printer tensioners, 0.3–0.5 mm wire is typically sufficient. For clamping or heavier automation loads, 0.8–1.2 mm wire is recommended. Contact us if you need specific load-deflection data for your variant.
Stainless steel provides good resistance to oxidation, humidity, and mild chemical exposure compared to carbon steel springs. These springs are suitable for indoor humid environments, light outdoor exposure, and general-purpose mechanical assemblies. For highly aggressive chemical environments (e.g., strong acids or chloride-rich saltwater immersion), consult a materials engineer before use.
Yes. These compression springs are commonly used in CNC router Z-axis return mechanisms, 3D printer bed leveling and extruder tensioner assemblies, and linear motion systems. Select the wire diameter and outside diameter that fit your existing spring pocket or guide rod, and choose a free length that provides adequate working stroke for your axis travel.
Long compression springs with a high free-length-to-outside-diameter ratio are prone to lateral buckling. To prevent this, guide the spring over a rod (inner guide) or inside a bore (outer guide). As a general rule, if the free length exceeds 4× the outside diameter, a guide is recommended. All four length options in this listing (120–200 mm) benefit from a guide rod or housing bore for reliable axial compression.
Each listing variant is sold as a single spring (quantity: 1 piece). If you need multiple pieces of the same size, simply adjust the quantity in your cart. Buying multiple pieces of the same variant is a cost-effective way to stock spares for maintenance or prototyping.
Measure three dimensions on your existing spring: (1) wire diameter using calipers, (2) outside diameter across the coil body, and (3) free length when the spring is fully unloaded and not compressed. Match these three values to the variant options in this listing. If your existing spring falls between two sizes, choose the closest match and verify fit in your assembly before final installation.
