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When a project demands consistent return force and dimensional accuracy, finding the right compression spring in the exact wire diameter and outer diameter can be a frustrating search. Whether you are a hobbyist building a custom mechanism, a technician repairing equipment, or an engineer prototyping a new device, these compression springs give you the precise sizing you need without ordering in bulk or waiting on custom fabrication.
Each spring is wound from steel wire with diameters ranging from 0.3 mm to 4.5 mm (approximately 0.012 in to 0.177 in), with outer diameters spanning 2 mm to 36 mm (approximately 0.079 in to 1.417 in), and a uniform free length of 300 mm (approximately 11.81 in). The coil geometry is designed to deliver consistent spring force across the full compression range, with a closed-end or open-end configuration depending on the selected variant.
These compression springs are well-suited for use in mechanical assemblies requiring controlled return force, such as valve mechanisms, jig fixtures, and tool spring returns; in electronics enclosures where contact springs or battery retention springs are needed; and in DIY fabrication projects including custom suspension linkages, latch mechanisms, and spring-loaded clamps.
Wire diameters from 0.3 mm to 4.5 mm and ODs from 2 mm to 36 mm cover a broad spectrum of mechanical requirements in a single product listing.
A consistent 300 mm (11.81 in) free length allows you to cut or use the spring as-is, providing flexibility for both standard and custom-length applications.
Wound from steel wire, these springs deliver reliable elastic return force and maintain coil geometry under repeated compression cycles.
Consistent pitch and coil spacing across the full length ensure uniform load distribution and predictable deflection behavior during use.
From valve springs and latch mechanisms to battery contacts and jig fixtures, these springs adapt to a wide range of DIY and mechanical assembly tasks.
Available in individual pieces or multi-pack quantities, so you can order exactly what your project requires without unnecessary surplus.
| Spring Type | Compression Spring |
|---|---|
| Wire Diameter Range | 0.3 mm – 4.5 mm (0.012 in – 0.177 in) |
| Outer Diameter (OD) Range | 2 mm – 36 mm (0.079 in – 1.417 in) |
| Free Length | 300 mm (11.81 in) |
| Material | Steel wire |
| Finish / Colour | See variant options |
| Spring Rate | See variant options |
| End Type | See variant options |
| Coil Direction | See variant options |
| Packing Quantity | 1 pc or multi-pack (see variant options) |
Start by measuring the bore or housing inner diameter your spring must fit inside — the spring OD should be slightly smaller than the bore. Then consider the load requirement: a thicker wire diameter (higher wire dia) produces a stiffer spring with greater force per unit of compression. For light-duty contact or retention applications, wire diameters of 0.3 mm–0.8 mm are typical; for structural or mechanical return applications, 1.0 mm–4.5 mm wire diameters are more appropriate.
Spring rate (also called stiffness) is the force required to compress the spring by one unit of length (e.g., N/mm). A higher wire diameter relative to the OD produces a higher spring rate. Because spring rate varies by specific wire dia and OD combination, please contact us to confirm the spring rate for your selected variant if your application has a defined load requirement.
These springs are wound from steel wire. Standard steel springs are suitable for indoor and dry environments. For applications exposed to moisture, chemicals, or outdoor conditions, consider applying a protective coating after installation, or contact us to confirm whether a coated or stainless variant is available for your required size.
Yes, compression springs can be cut to a shorter free length using a rotary tool or spring cutter. After cutting, the end coils may need to be ground flat to ensure even load distribution. Note that cutting changes the number of active coils and therefore alters the spring rate — the shorter the cut length, the stiffer the spring will become.
For a guide rod (inner guide), the rod diameter should be approximately 1–2 mm smaller than the spring inner diameter (ID = OD minus 2× wire diameter). For a bore (outer guide), the bore diameter should be approximately 1–2 mm larger than the spring OD. This clearance prevents binding during compression while keeping the spring aligned.
These springs are designed for general mechanical and DIY use, including moderate-cycle applications such as jig fixtures, latch mechanisms, and tool returns. For high-cycle industrial applications (millions of cycles under heavy load), we recommend confirming the fatigue rating and material specification with us before ordering, as requirements vary significantly by application.
Select the packing quantity variant that matches your project needs. Single-piece (1 pc) options are available for prototyping or single-unit repairs. Multi-pack options are available for batch builds or production runs. If you need a quantity not listed, contact us and we can advise on bulk ordering options.
