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When a worn-out spring causes equipment downtime or a DIY repair stalls because you can't find the right size, the frustration is real. These compression springs are designed for engineers, maintenance technicians, and hands-on DIYers who need a reliable, dimensionally accurate spring without waiting on custom orders. Available in wire diameters from 1.8mm to 4.5mm and outside diameters from 10mm to 43mm, this range covers a wide spectrum of load and deflection requirements.
Each spring is wound from steel wire with a consistent helical pitch, delivering uniform load distribution across the 300mm free length (approximately 11.81 inches). Wire diameters span 1.8mm, 2.0mm, 2.5mm, 3.0mm, 3.5mm, 4.0mm, and 4.5mm; outside diameters range from 10mm (~0.39 in) to 43mm (~1.69 in). The closed-end coil geometry ensures stable seating on flat surfaces without additional fixtures.
Typical use cases include replacing compression springs in industrial machinery and conveyor systems, restoring suspension or valve mechanisms in automotive and agricultural equipment, and serving as return springs in custom jigs, fixtures, and DIY mechanical projects where a specific wire-to-OD ratio is required.
Wire diameters from 1.8mm to 4.5mm paired with outside diameters from 10mm to 43mm — one listing covers dozens of load and deflection combinations.
All variants share a consistent 300mm (~11.81 in) free length, simplifying drop-in replacement for applications with defined spring pockets.
Closed ends provide a flat bearing surface for stable seating without additional hardware, reducing assembly time in both production and repair contexts.
Uniform coil spacing ensures even load distribution along the spring body, reducing the risk of lateral buckling under compression.
Suited for machinery, automotive, agricultural equipment, and custom DIY fixtures — wherever a reliable compression spring with defined geometry is needed.
Each variant is a distinct wire diameter and outside diameter combination, so you receive exactly the spring geometry you select — no guesswork, no sorting required.
| Spring Type | Compression Spring (Pressure Spring) |
|---|---|
| Wire Diameter Range | 1.8mm / 2.0mm / 2.5mm / 3.0mm / 3.5mm / 4.0mm / 4.5mm |
| Outside Diameter Range | 10mm – 43mm (see variant options) |
| Free Length | 300mm (~11.81 in) |
| End Type | Closed ends |
| Coil Direction | See variant options |
| Material | Steel wire (spring steel) |
| Surface Finish | See variant options |
| Load Rate | See variant options |
| Inner Diameter | See variant options (OD minus 2× wire diameter) |
| Number of Coils | See variant options |
| Operating Temperature | Contact us to confirm |
Start with the bore or housing diameter your spring must fit inside — the spring's outside diameter should be slightly smaller than the bore. Then select a wire diameter based on the load you need: heavier wire (e.g., 3.5mm–4.5mm) produces stiffer springs with higher load rates, while lighter wire (1.8mm–2.5mm) gives softer, more compliant springs. If you're replacing an existing spring, measure the original wire diameter, outside diameter, and free length before ordering.
The free length is the overall length of the spring when it is not under any load. All variants in this listing share a fixed free length of 300mm (approximately 11.81 inches). Only the wire diameter and outside diameter change between variants.
The load capacity depends on the specific wire diameter and outside diameter combination you select. Larger wire diameters (3.5mm–4.5mm) with smaller outside diameters produce higher spring rates and are suitable for more demanding mechanical applications. For critical load-bearing applications, we recommend verifying the spring rate against your design requirements before installation.
These springs are made from steel wire. For environments with moisture, chemicals, or outdoor exposure, consider whether a coated or stainless steel variant is required for your application. If corrosion resistance is a key requirement, please contact us to confirm the available surface treatment options for your selected size.
These springs are suitable for light-to-medium automotive and mechanical applications such as valve return springs, throttle return mechanisms, and similar uses where the spring geometry matches. They are not rated for primary suspension strut replacement in passenger vehicles. Always verify the spring rate, free length, and diameter against your OEM specifications before installation.
The inner diameter (ID) is approximately equal to the outside diameter (OD) minus twice the wire diameter. For example, a spring with a 25mm OD and 2.5mm wire diameter has an inner diameter of approximately 25 − (2 × 2.5) = 20mm. Use this to check clearance over a shaft or guide rod.
This listing covers the 300mm free length only. If you require a different free length, please contact us — we may be able to assist with alternative options or point you to the correct listing for your required dimensions.
