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When a machine stalls, a mechanism jams, or a DIY project demands consistent return force, the culprit is often an undersized or worn-out compression spring. Engineers, makers, and maintenance technicians who need a dependable coil spring with a 3.0mm wire diameter will find this range covers the most common industrial and hobbyist requirements without compromise.
Each spring is wound from carbon steel wire with a nominal wire diameter of 3.0mm (0.118 in). Outer diameters span 16mm to 40mm (0.63 in – 1.57 in), and free lengths range from 20mm to 100mm (0.79 in – 3.94 in), giving you precise control over spring rate and travel. Ends are closed and ground for flat, stable seating on both ends.
Typical use cases include industrial machinery damping, automotive jig fixtures, 3D-printer bed leveling assemblies, pneumatic valve returns, and custom DIY mechanical linkages — all scenarios where a consistent, repeatable compression spring with a 3.0mm wire diameter is essential.
| Wire Diameter | 3.0 mm (0.118 in) |
|---|---|
| Outer Diameter | 16 – 40 mm (0.63 – 1.57 in) — see variant options |
| Free Length | 20 – 100 mm (0.79 – 3.94 in) — see variant options |
| End Type | Closed and ground |
| Material | Carbon steel |
| Spring Type | Compression |
| Coil Direction | Right-hand |
| Surface Finish | See variant options |
| Pack Quantity | 10 pieces per pack |
| Spring Rate | See variant options |
Measure the bore or pocket that will house the spring and select an outer diameter 1–2mm smaller than the bore for a guided fit. For free length, choose a spring whose free length is at least 20–30% longer than your required compressed length to keep the spring within its elastic range. Use the variant selector above to pick the exact outer diameter and free length combination.
Load capacity depends on the outer diameter, free length, and number of active coils — all of which vary by variant. As a general guide, 3.0mm wire springs in this range are suited to medium-duty applications typically requiring 10–80 N of force at working deflection. Contact us with your specific deflection and load requirements for a closer match.
These springs are made from carbon steel, which offers good mechanical strength but limited corrosion resistance in wet or chemically aggressive environments. For outdoor or humid applications, consider applying a light coat of oil or grease, or contact us to confirm whether a coated variant is available for your size.
Yes. Compression springs with a 3.0mm wire diameter and outer diameters in the 16–20mm range are commonly used in 3D-printer bed-leveling assemblies. Select a free length that gives you adequate adjustment travel — typically 20–30mm free length works well for most bed-leveling setups. Verify the outer diameter fits your printer's spring pocket before ordering.
Closed ends mean the last coil is wound tightly against the adjacent coil, and ground ends mean that closed coil is machined flat. This creates a perpendicular, stable bearing surface that reduces lateral buckling and ensures the spring sits squarely in its pocket or on a guide rod — critical for consistent force delivery in precision fixtures and machinery.
Each pack contains 10 identical springs of the selected outer diameter and free length. This quantity is suitable for small production runs, prototyping batches, or stocking spares. If you need larger quantities, contact us for bulk pricing options.
Yes. The 3.0mm wire diameter and closed-ground ends make these springs suitable for automotive jig fixtures, pneumatic valve returns, tooling clamps, and general industrial machinery where a reliable medium-duty compression spring is required. Always verify the spring rate and solid height against your design specifications before installation.
