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When a mechanism fails because a spring loses tension or collapses under load, the root cause is almost always a mismatch between wire diameter, outer diameter, and free length. Engineers, machinists, and serious DIYers who need a reliable compression spring in a specific size — without ordering a custom batch — face this problem constantly. These compression pressure springs are stocked across a wide dimensional matrix so you can match your application precisely rather than settling for the closest standard size.
Each spring is formed from round wire with diameters ranging from 2mm to 3.5mm (0.079" to 0.138"), wound to outer diameters spanning 10mm to 60mm (0.39" to 2.36"), and cut to a free length of 300mm (11.81"). The coil geometry follows a close-pitch, open-end or closed-end profile depending on the variant selected. Material is spring steel, with surface finish consistent with industrial-grade coil spring production.
Typical use cases include mechanical assemblies requiring consistent return force (e.g., valve actuators, jig fixtures, and press tooling), electronics enclosures where a spring-loaded contact or latch must cycle reliably, and DIY fabrication projects such as custom suspension linkages, drawer mechanisms, or spring-loaded clamps. The 300mm free length also makes these suitable as raw stock that can be cut to shorter working lengths on a lathe or angle grinder.
| Wire Diameter | 2mm / 2.5mm / 3mm / 3.5mm (0.079"–0.138") |
|---|---|
| Outer Diameter (OD) | 10mm–60mm (0.39"–2.36") — see variant options |
| Free Length | 300mm (11.81") |
| Material | Spring steel |
| Spring Type | Compression (coil) |
| End Type | See variant options |
| Surface Finish | See variant options |
| Spring Rate | See variant options |
| Quantity per Order | 1 Pcs or 5 Pcs |
Start with the housing bore or guide rod your spring must fit around or inside. The outer diameter of the spring should be 1–2mm smaller than the bore ID (for a guided spring inside a hole) or the inner diameter should clear the guide rod by 1–2mm. Wire diameter determines the spring rate and load capacity — a thicker wire produces a stiffer spring. If you need a specific spring rate, calculate it using the formula: k = (G × d⁴) / (8 × D³ × n), where G is the shear modulus of spring steel (~80 GPa), d is wire diameter, D is mean coil diameter, and n is the number of active coils.
Load capacity depends on the specific wire diameter, outer diameter, and number of active coils in your selected variant. Larger wire diameters (e.g., 3.5mm) wound to smaller outer diameters produce higher spring rates and load capacities. For precise load values, use the spring rate formula or contact us with your deflection and load requirements so we can confirm the correct variant.
These springs are made from spring steel, which offers good mechanical properties but moderate corrosion resistance. For outdoor, wet, or chemically exposed environments, consider applying a protective coating (e.g., zinc spray or oil) after installation, or contact us to inquire about stainless steel alternatives. For dry indoor mechanical applications, spring steel performs reliably over extended service life.
Yes. The 300mm free length is intentionally generous so the spring can be cut to a shorter working length. Use an angle grinder with a thin cut-off disc or a lathe parting tool. After cutting, lightly grind the cut end flat to ensure even seating. Note that cutting changes the number of active coils and therefore the spring rate — recalculate your spring rate after cutting if load accuracy is critical.
The 1 Pcs option is ideal for prototyping, testing fit, or replacing a single failed spring. The 5 Pcs option provides a working set for multi-spring assemblies or a spare supply for maintenance. The 5 Pcs pack offers a lower per-unit cost compared to buying five individual pieces separately.
Order the 1 Pcs variant of your target size first. Measure the installed free length, compressed length, and load at your working deflection point. Compare against your design requirements. If the spring rate is too high or too low, adjust the outer diameter or wire diameter — a larger OD with the same wire diameter gives a softer spring; a smaller OD gives a stiffer one. Once confirmed, order the 5 Pcs pack for your production or maintenance stock.
These compression springs are used across a wide range of applications: valve actuators in pneumatic and hydraulic systems, jig and fixture clamping mechanisms in machining, spring-loaded electrical contacts in enclosures and switches, drawer and cabinet latch mechanisms in furniture, custom suspension linkages in small vehicles and robotics, and press tooling in stamping and forming operations. The 300mm length also makes them useful as raw spring stock for custom fabrication.
