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When a loose or undersized spring causes a mechanism to fail mid-task, the frustration is real — especially when you can't find the exact spec you need. These compression pressure springs are engineered for engineers, machinists, hobbyists, and serious DIYers who need a reliable, dimensionally accurate coil spring without ordering in bulk or waiting weeks for custom fabrication.
Each spring is formed from spring steel wire ranging from 0.3mm to 3mm in diameter, with outside diameters spanning 3mm to 50mm (~0.12" to ~1.97") and a consistent free length of 305mm (~12.0"). The wire-to-OD ratio is carefully maintained across all variants to ensure proper coil geometry and consistent spring rate performance.
Typical use cases include compression spring replacement in mechanical assemblies, return-force applications in jigs and fixtures, valve spring substitution in small pneumatic or hydraulic systems, and custom spring prototyping for robotics or automation projects requiring precise load-deflection characteristics.
Wire diameter from 0.3mm to 3mm; outside diameter from 3mm to 50mm — covering a broad spectrum of mechanical applications in a single product line.
Formed from spring steel with consistent elastic properties, delivering reliable return force and resistance to permanent set under repeated compression cycles.
Each spring ships at a free length of 305mm (~12.0"), giving you flexibility to cut to working length or use as-is for long-stroke applications.
Consistent wire-to-OD ratios across all variants ensure predictable spring rate behavior — critical for load-sensitive assemblies and prototyping work.
Available in individual pieces (1 PCS per listing), so you can source exactly the quantity you need without committing to bulk packs.
Suited for mechanical assemblies, jigs, fixtures, robotics, valve returns, and DIY repair projects requiring a compact, reliable compression element.
| Material | Spring Steel |
|---|---|
| Wire Diameter Range | 0.3mm – 3mm (0.012" – 0.118") |
| Outside Diameter Range | 3mm – 50mm (0.12" – 1.97") |
| Free Length | 305mm (12.0") |
| Spring Type | Compression (Closed / Ground ends — See variant options) |
| Surface Finish | See variant options |
| Spring Rate | See variant options |
| Quantity per Unit | 1 PCS |
Start with your housing bore (inner diameter of the cavity the spring sits in) — the spring's outside diameter should be 0.5mm to 1mm smaller than the bore for a sliding fit. Then select a wire diameter that gives you the load capacity you need: thicker wire = higher spring rate and load. Use the variant selector to match both dimensions to your assembly drawing or measured values.
Yes. Spring steel can be cut with an angle grinder or rotary tool with a cutting disc. After cutting, lightly grind the end coil flat to restore a stable seating surface. Note that cutting changes the spring rate — a shorter spring of the same wire/OD will be stiffer (higher rate per unit length).
Spring rate depends on wire diameter, outside diameter, number of active coils, and material modulus. Because the free length is 305mm and coil count varies by variant, exact spring rate figures are not listed — contact us with your wire dia and OD selection and we can provide an estimated rate, or use a spring rate calculator with the measured coil count after receipt.
Spring steel offers moderate corrosion resistance suitable for indoor and dry environments. For outdoor, humid, or chemically exposed applications, consider applying a light coat of oil or grease after installation, or contact us about stainless steel alternatives if your environment demands higher corrosion resistance.
Wire diameter is the thickness of the steel wire used to wind the coil — it determines load capacity and stiffness. Outside diameter is the total width of the coiled spring — it determines whether the spring fits inside a bore or around a shaft. Both must be matched to your assembly: OD fits the housing, wire dia delivers the force you need.
These springs are general-purpose compression springs suitable for low-to-medium pressure return applications such as valve returns in pneumatic systems. For high-pressure hydraulic environments or safety-critical valve applications, consult an engineer and verify the spring rate and fatigue life against your system's cycle requirements before use.
Measure your housing bore ID and shaft OD (if applicable), then select an OD that is slightly smaller than the bore and slightly larger than the shaft (if guided on a shaft). Confirm the wire diameter matches your load requirement. If you are replacing an existing spring, measure the original's wire dia, OD, and free length directly with calipers.
