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When a mechanism fails because a spring loses tension too quickly or collapses under load, the root cause is almost always a mismatch between wire diameter, outer diameter, and material. Engineers, makers, and repair technicians who need a reliable 45mm compression spring with a defined outer diameter and wire gauge will find this listing covers the widest practical range in one place.
Each spring in this listing has a free length of 45 mm (approx. 1.77 in). Wire diameters span 1.4 mm to 4 mm (0.055 in – 0.157 in) and outer diameters range from 8 mm to 60 mm (0.31 in – 2.36 in). Three material options are available: spring steel (carbon steel), 304 stainless steel, and nickel-plated spring steel. Quantity options per order range from 1 pc to 10 pcs depending on the variant selected.
Typical use cases include CNC machine tool return mechanisms, 3D printer bed-leveling springs, automotive valve and latch assemblies, robotics end-effector compliance joints, and DIY jig or fixture clamping systems. Long-tail search terms that describe this product: small compression spring 45mm free length, metric coil spring OD 10mm–30mm, stainless compression spring corrosion resistant, spring steel pressure spring bulk pack.
| Free Length | 45 mm (1.77 in) |
|---|---|
| Wire Diameter | 1.4 mm / 1.5 mm / 1.6 mm / 1.8 mm / 2 mm / 2.2 mm / 2.5 mm / 3 mm / 3.5 mm / 4 mm |
| Outer Diameter (OD) | 8 mm – 60 mm (see variant options) |
| Material | Spring steel (carbon steel) / 304 Stainless steel / Nickel-plated spring steel |
| Spring Type | Compression (coil) |
| End Type | See variant options |
| Spring Rate | See variant options |
| Load Capacity | See variant options |
| Surface Finish | Natural / Stainless / Nickel plated (by material selection) |
| Quantity per Pack | 1 / 2 / 5 / 10 pcs (see variant options) |
| Standard | Contact us to confirm |
Measure the bore or housing ID that the spring will sit inside. The spring OD should be 0.5–1 mm smaller than the bore ID to allow free compression without binding. If the spring sits over a guide rod, the spring ID (OD minus 2× wire diameter) should be at least 0.5 mm larger than the rod OD.
Spring steel (carbon steel) offers higher tensile strength and is suitable for dry indoor environments. 304 stainless steel provides good corrosion resistance in humid, outdoor, or mildly acidic conditions and is preferred for food-adjacent or marine applications. Nickel-plated spring steel sits between the two — it adds a corrosion barrier while retaining the spring steel's mechanical properties.
The stainless steel variants are suitable for outdoor and humid environments. The nickel-plated variants offer moderate corrosion protection for light outdoor or indoor-humid use. Plain spring steel variants are best kept in dry environments or protected with a light oil coating if exposed to moisture.
Yes. The 45 mm free length and the range of OD options (particularly 8–20 mm) are commonly used in bed-leveling and Z-axis compensation assemblies. Select a wire diameter that provides the spring rate needed to support your bed weight while remaining compressible by your adjustment knobs. Stainless steel variants are recommended to avoid rust staining on the bed surface.
Heavier wire diameters (e.g., 3–4 mm) produce stiffer springs with higher load capacity, suitable for clamping fixtures, automotive latches, or heavy return mechanisms. Lighter wire diameters (e.g., 1.4–1.8 mm) produce softer springs for light-duty applications such as electronics switches, pen mechanisms, or sensor return springs. If you need a specific spring rate, contact us with your load and deflection requirements.
For prototyping or single-unit repair, the 1 pc or 2 pcs options let you test fit and function without committing to a larger pack. For small-batch production or to keep spares on hand, the 5 pcs or 10 pcs packs offer better per-unit value. Select the quantity in the "Material Selection & Qty" variant option above.
Yes. All dimensions follow metric standards. The OD values listed (8 mm through 60 mm) correspond to common metric bore sizes. Always verify the free length (45 mm), OD, and wire diameter against your assembly drawing before ordering, as spring seats vary by manufacturer.
