Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.
When a machine component fails because the spring underneath it can't hold its rated load, the entire assembly pays the price. Engineers, maintenance technicians, and serious DIYers who need a dependable compression spring with a 3mm wire diameter and a wide selection of outer diameters and free lengths will find exactly what they need here. These springs are designed for applications where consistent return force, dimensional accuracy, and corrosion resistance are non-negotiable.
Each spring is wound from 3mm wire and is available in outer diameters ranging from 16mm to 40mm (approximately 0.63 in to 1.57 in) and free lengths from 30mm to 100mm (approximately 1.18 in to 3.94 in). The body is manufactured from carbon steel with a zinc-plated or phosphate finish (see variant options for exact finish), providing a balance of tensile strength and surface protection suited to both indoor and light outdoor environments.
Typical use cases include automotive suspension sub-assemblies requiring a compact compression spring replacement, industrial valve and actuator mechanisms that demand repeatable spring force, and workshop jigs or fixture clamps where a 3mm wire compression spring provides the clamping tension needed for consistent part positioning. The broad size matrix also makes these springs a go-to stock item for maintenance departments managing diverse equipment.
| Wire Diameter | 3mm (0.118 in) |
|---|---|
| Outer Diameter Range | 16mm – 40mm (0.63 in – 1.57 in) |
| Free Length Range | 30mm – 100mm (1.18 in – 3.94 in) |
| Material | Carbon Steel |
| Surface Finish | See variant options |
| End Type | Closed & Ground |
| Spring Rate | See variant options |
| Load Capacity | See variant options |
| Coil Direction | Right-hand (standard) |
| Operating Temperature | Typically –20°C to +120°C (–4°F to +248°F) |
| Quantity per Order | 1 piece |
Measure the bore or housing that the spring sits inside, then select an outer diameter that is 1–2mm smaller than the bore to allow free movement without binding. If the spring sits over a rod or post, the inner diameter (outer diameter minus twice the wire diameter) must be larger than the rod. For this range, inner diameters run approximately 10mm to 34mm depending on the outer diameter selected.
Load capacity depends on the outer diameter, free length, and the amount of compression (deflection). Larger outer diameters and shorter free lengths generally produce higher spring rates and load capacities. For precise load values at a specific deflection, please contact us with your outer diameter and free length selection so we can provide the spring rate data.
The surface finish (zinc plate or phosphate, see variant options) provides moderate corrosion resistance suitable for indoor and sheltered outdoor environments. For prolonged exposure to moisture, salt spray, or chemicals, consider applying a light coat of grease or selecting a stainless steel alternative. These carbon steel springs are not recommended for fully submerged or highly corrosive environments without additional protection.
Yes. The 3mm wire diameter and closed-ground ends make these springs well-suited for light automotive sub-assemblies, valve return mechanisms, and actuator springs where the dimensional envelope matches. Always verify the spring rate and solid height against your application's travel and load requirements before installation.
Free length is the overall length of the spring when no load is applied — this is the dimension listed in the variant options (30mm to 100mm). Compressed length (solid height) is the length when all coils are touching under maximum load. For a 3mm wire spring, solid height is approximately the number of total coils multiplied by 3mm. Ensure your application provides enough travel between free length and solid height to avoid coil bind.
Choose a free length that allows the spring to operate within 20–80% of its total deflection range during normal use. A spring that is too short may bottom out (coil bind) under load; one that is too long may buckle laterally. If your housing depth is fixed, select the longest free length that fits with at least 5mm of clearance at full compression.
Yes. These compression springs feature closed and ground ends, which provide a flat bearing surface for stable seating on spring pads or in recessed housings. This reduces lateral deflection under load and ensures more consistent force transmission compared to open-end springs.
