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When a drawer stops closing flush, a valve loses its return force, or a DIY mechanism needs consistent push-back, the culprit is almost always a worn or incorrectly sized compression spring. Whether you are a home repair enthusiast, a mechanical hobbyist, or a small-batch manufacturer, finding the exact coil diameter and wire gauge in one place saves hours of searching.
These 80 mm (≈ 3.15 in) long compression springs are wound from round wire and are available in three materials — spring steel, stainless steel, and zinc-plated carbon steel — with wire diameters ranging from 0.5 mm to 1.8 mm (0.020–0.071 in) and coil outer diameters from 3 mm to 30 mm (0.12–1.18 in). Pack sizes range from 1 pc to 5 pcs per order, letting you stock exactly what you need.
Typical applications include furniture hardware and drawer slides, automotive and motorcycle valve assemblies, pneumatic and hydraulic control valves, electronic enclosure latches, and custom jigs or fixtures in workshop settings — all scenarios where a consistent, repeatable spring force is essential.
| Free Length | 80 mm (3.15 in) |
|---|---|
| Wire Diameter | 0.5 mm – 1.8 mm (0.020 – 0.071 in) — See variant options |
| Outer Diameter | 3 mm – 30 mm (0.12 – 1.18 in) — See variant options |
| Material | Spring steel / Stainless steel / Zinc-plated carbon steel — See variant options |
| Pack Quantity | 1 pc / 2 pcs / 5 pcs — See variant options |
| End Type | Closed & ground (flat ends) |
| Spring Type | Compression (push / return force) |
| Wind Direction | Right-hand |
| Surface Finish | Natural (spring steel), Bright (stainless steel), Zinc-plated (carbon steel) |
| Operating Temperature | Spring steel: typically –20 °C to +120 °C; Stainless steel: typically –60 °C to +200 °C |
Measure the bore or housing that the spring sits inside, then select an outer diameter (OD) that is 0.5–1 mm smaller than the bore for a sliding fit. If the spring sits over a rod or pin, measure the rod diameter and choose an inner diameter (ID = OD minus twice the wire diameter) that clears the rod by at least 0.5 mm. Use the variant selector to match your measured bore or rod size.
Spring steel (high-carbon steel) offers a higher spring rate per unit of wire diameter and is the standard choice for dry, indoor environments where corrosion is not a concern. Stainless steel costs more but resists rust, salt spray, and mild chemical exposure, making it the better choice for outdoor fixtures, marine hardware, food-processing equipment, or anywhere moisture is present. Zinc-plated carbon steel sits between the two: it provides a basic corrosion barrier at a lower cost than stainless, suitable for lightly humid indoor settings.
All metal springs experience a small amount of stress relaxation (set) over their service life, especially when compressed beyond their elastic limit. To maximise longevity, avoid compressing the spring to solid height (coil-bind) in normal operation. Stainless steel variants generally exhibit better fatigue resistance in cyclic applications compared to plain carbon spring steel.
For outdoor or wet environments, select the stainless steel variants. The zinc-plated option provides limited corrosion protection and is best suited to dry or lightly humid indoor use. Spring steel without a protective coating will rust if exposed to moisture and is not recommended for outdoor applications.
Spring rate (k) is determined by wire diameter (d), coil outer diameter (D), number of active coils (n), and the shear modulus of the material. The formula is k = (G × d⁴) / (8 × D³ × n). Because the number of active coils varies by variant, contact us with your required load and deflection values and we can help confirm the best wire gauge and diameter combination for your load case.
For a single repair where you know the exact spring that failed, a 1 pc or 2 pcs pack is sufficient. If you are servicing multiple units of the same product (e.g., a set of drawers or a batch of valves), the 5 pcs pack offers a lower per-unit cost and leaves you with spares for future maintenance. For workshop stock or prototyping, the 5 pcs pack is the most practical choice.
