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When a worn or undersized spring causes your mechanism to lose tension, bind, or fail under load, finding the right replacement quickly matters. These 300mm compression springs are designed for hobbyists, engineers, and repair technicians who need a reliable, dimensionally consistent spring without ordering custom parts.
Each spring is wound from round steel wire with diameters ranging from 0.3mm to 1.6mm, and outside diameters (OD) spanning 2mm to 25mm (approximately 0.08 in to 0.98 in). The fixed free length is 300mm (approximately 11.81 in). The wire is typically finished with a smooth, close-wound coil structure suited for axial compression loads.
Typical use cases include DIY mechanical assemblies requiring custom spring tension, replacement springs for small appliances and tooling fixtures, and precision compression elements in jigs, clamps, and prototype mechanisms where a specific wire-to-OD ratio is needed.
Wire diameters from 0.3mm to 1.6mm; outside diameters from 2mm to 25mm — covering a broad spectrum of light-duty to medium-duty compression needs.
All variants share a consistent 300mm free length, making it straightforward to cut or use as-is for your target compressed height.
Wound from round cross-section wire for uniform stress distribution along the coil body, supporting consistent deflection behavior under load.
Choose from combinations that give you a lighter, more flexible spring or a stiffer, higher-load spring — all within the same 300mm length family.
Compact coil geometry fits standard spring pockets and guide rods. Suitable for replacement, prototyping, and custom mechanical builds.
Each listing is for one spring in your selected wire diameter and outside diameter combination, so you order exactly what you need.
| Spring Type | Compression Spring |
|---|---|
| Wire Diameter Range | 0.3mm – 1.6mm (0.012 in – 0.063 in) |
| Outside Diameter (OD) Range | 2mm – 25mm (0.08 in – 0.98 in) |
| Free Length | 300mm (11.81 in) |
| Wire Cross-Section | Round |
| Material | See variant options |
| Surface Finish | See variant options |
| Spring Rate | See variant options |
| End Type | See variant options |
| Quantity per Order | 1 piece |
Start with your housing bore (inner diameter of the pocket the spring sits in) — the spring OD should be slightly smaller than the bore. Then consider your load requirement: a thicker wire diameter produces a stiffer spring with higher load capacity, while a thinner wire diameter gives a softer, more flexible spring. If you are replacing an existing spring, measure the original wire diameter and OD with calipers before selecting.
The load capacity depends on the specific wire diameter and OD combination you select. Thicker wire diameters (e.g., 1.4mm–1.6mm) with smaller OD ratios produce higher spring rates and load capacity. Thinner wire diameters (e.g., 0.3mm–0.5mm) are suited for light-duty, low-force applications. If you need an exact spring rate value, contact us to confirm for your chosen variant.
The corrosion resistance depends on the wire material and surface finish of the specific variant. For applications in humid or outdoor environments, we recommend confirming the material specification with us before ordering. If corrosion resistance is critical, consider pairing with a protective coating or selecting a stainless steel variant where available.
Yes, compression springs can typically 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 seating. Note that cutting changes the spring rate and load characteristics, so factor this into your design if precision is required.
The inside diameter is calculated as: ID = Outside Diameter (OD) − (2 × Wire Diameter). For example, a spring with OD 10mm and wire diameter 1.0mm has an ID of approximately 8mm. Use this to check clearance over a guide rod or shaft in your assembly.
These springs are designed for general DIY, repair, and light mechanical applications. For high-cycle industrial use or safety-critical applications, please contact us to confirm material grade and fatigue life specifications before ordering.
Measure your existing spring's wire diameter, outside diameter, and free length with calipers. Match those dimensions to the variant options above. Also verify that the compressed length (solid height) of the new spring fits within your mechanism's travel range. If you are unsure, contact us with your measurements and we can help you select the correct variant.
