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When a machine stops working because a worn-out spring can no longer hold its load, sourcing the right replacement fast is everything. Engineers, maintenance technicians, and hands-on DIYers who need a compression spring with a 4.5mm wire diameter and a free length between 30mm and 150mm will find a matching size in this range — without waiting on custom fabrication lead times.
Each spring is formed from steel wire with a nominal wire diameter of 4.5mm (approximately 0.177 in). Outer diameters span 25mm to 70mm (roughly 0.98 in to 2.76 in), and free lengths run from 30mm to 150mm (1.18 in to 5.91 in). Springs are sold in sets of 2 pieces per order. Exact coil count, spring rate, and surface finish vary by size — see variant options for the combination that fits your application.
Typical use cases include industrial machinery maintenance where a compression spring for equipment repair is needed quickly, automotive and motorcycle suspension sub-assemblies requiring a steel coil spring replacement, and workshop jigs or fixture clamping systems that rely on a consistent return force from a mechanical compression spring.
| Wire Diameter | 4.5 mm (0.177 in) |
|---|---|
| Outer Diameter (OD) | 25 mm – 70 mm (0.98 in – 2.76 in) — See variant options |
| Free Length | 30 mm – 150 mm (1.18 in – 5.91 in) — See variant options |
| Material | Steel |
| End Type | See variant options |
| Spring Rate | See variant options |
| Surface Finish | See variant options |
| Coil Direction | See variant options |
| Quantity per Order | 2 pieces |
| Spring Type | Compression |
Measure the bore or housing your spring sits in to determine the maximum allowable outer diameter — leave at least 1–2mm clearance. Then measure the available cavity depth and your required working travel to calculate the free length you need. Select the variant whose OD and free length best match those measurements.
Load capacity depends on the combination of wire diameter, OD, free length, and number of active coils. A 4.5mm wire diameter is suited to medium-duty applications. For precise spring rate and maximum load data for a specific size, contact us to confirm before ordering.
These springs are made from steel. Standard steel springs are suitable for dry or lightly oiled indoor environments. For outdoor, wet, or chemically aggressive environments, consider applying a protective coating or contact us to discuss material options.
These compression springs are designed to general mechanical tolerances. Verify the OD against your pocket diameter and the inner diameter (ID = OD minus twice the wire diameter) against any guide rod diameter before ordering. The ID for a 25mm OD spring with 4.5mm wire is approximately 16mm, scaling up proportionally for larger OD variants.
These springs are suitable for light automotive sub-assemblies, jigs, and fixtures. For primary suspension or safety-critical automotive applications, always verify the spring rate, travel, and load rating against your vehicle's specifications before installation.
Many mechanical assemblies use springs in pairs — for example, symmetrical clamping fixtures, dual-return mechanisms, or paired mounting points. Selling in 2-piece sets ensures you have a matched pair and a spare for maintenance without needing to place a second order.
Use calipers to measure: (1) wire diameter, (2) outer diameter, and (3) free length (uncompressed). Match these three dimensions to the variant options above. If your existing spring is slightly worn, measure carefully as springs can shorten under long-term load.
