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When a mechanism fails because a worn-out spring loses its tension, the entire assembly pays the price. Engineers, hobbyists, and maintenance technicians who need a dependable, corrosion-resistant compression spring in a compact wire gauge will find this 1.8mm wire diameter stainless coil spring an exact-fit solution across a wide range of applications.
Each spring is formed from stainless steel wire with a diameter of 1.8mm (approximately 0.071 in), available in outer diameters from 10mm to 30mm (approx. 0.39–1.18 in) and free lengths from 10mm to 100mm (approx. 0.39–3.94 in). The open-coil helical design delivers consistent axial load resistance across the full compression stroke.
Typical use cases include mechanical actuators requiring a 1.8mm wire compression spring, DIY jig and fixture clamping systems, valve return mechanisms in fluid control assemblies, and small-scale robotics or automation projects where a compact stainless coil spring with precise OD control is essential.
Consistent 1.8mm (0.071 in) wire gauge across all variants ensures uniform spring rate and predictable load-deflection behavior.
Outer diameters from 10mm to 30mm (0.39–1.18 in) cover a broad spectrum of housing bores and guide rod sizes in a single product line.
Free lengths from 10mm to 100mm (0.39–3.94 in) let you match stroke requirements precisely without cutting or shimming.
Stainless steel wire resists oxidation and surface corrosion in humid, wet, or mildly corrosive environments — extending service life compared to carbon steel alternatives.
The open-coil geometry allows full compression without coil binding across the rated stroke, maintaining consistent return force throughout the spring's travel.
Available in packs of 1, 2, 5, or 10 pieces depending on the selected length and OD — order exactly what your project requires without overstocking.
| Material | Stainless Steel |
|---|---|
| Wire Diameter | 1.8mm (0.071 in) |
| Outer Diameter (OD) | 10mm – 30mm (0.39 – 1.18 in) — See variant options |
| Free Length | 10mm – 100mm (0.39 – 3.94 in) — See variant options |
| Spring Type | Compression (Open-Coil Helical) |
| End Type | See variant options |
| Spring Rate | See variant options |
| Surface Finish | Natural Stainless (uncoated) |
| Pack Quantity | 1 / 2 / 5 / 10 pcs — See variant options |
| Weight (per piece) | See variant options |
Measure the inner diameter of the housing bore (if the spring sits inside a bore) or the outer diameter of the guide rod (if the spring slides over a rod). For a bore-mounted spring, the OD should be 0.5–1mm smaller than the bore ID to allow free movement. For a rod-mounted spring, the spring ID (OD minus twice the wire diameter) should be 0.5–1mm larger than the rod OD. With a 1.8mm wire diameter, the approximate ID = OD − 3.6mm.
The free length should be long enough so that, when compressed to your working length, the spring still has remaining travel before coil bind. A general rule is: free length ≥ working length + (number of active coils × wire diameter). If you are unsure, select a free length 20–30% longer than your required compressed height and verify against your assembly's travel.
Spring rate depends on wire diameter, OD, and number of active coils. A 1.8mm wire spring is suited for light-to-medium duty loads — typically in the range of a few Newtons to tens of Newtons depending on the specific OD and length combination. For exact load-deflection data for your chosen variant, contact us to confirm.
Yes. Stainless steel offers significantly better corrosion resistance than standard carbon steel springs. It performs well in humid, wet, and mildly corrosive environments. For highly aggressive chemical environments (e.g., strong acids or chloride-rich saltwater immersion), additional material verification is recommended.
These springs follow standard open-coil helical geometry and are compatible with any housing or guide rod that matches the selected OD and length. Always verify the bore diameter, rod diameter, and available travel in your assembly against the specific variant dimensions before ordering.
For prototyping or single-unit repairs, the 1 or 2-piece packs are ideal. For small batch production, jig sets, or applications requiring matched springs (e.g., parallel spring arrays), the 5 or 10-piece packs offer better per-unit value and ensure consistent spring characteristics across all positions.
These are compression springs designed to resist axial compressive loads and return to their free length when the load is removed. They are not designed for tensile (pulling) loads. For tension applications, a separate extension spring with hooked ends would be required.
