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When your machine, fixture, or automation build demands a spring that holds its load cycle after cycle without fatigue, undersized wire simply won't do. Engineers, makers, and maintenance teams working with CNC equipment, industrial presses, and heavy-duty jigs need a compression spring with enough wire cross-section to resist set and deliver consistent return force — that's exactly what this 2.5mm wire series is built for.
Each spring in this listing is wound from 2.5mm diameter wire, with outer diameters (OD) ranging from 26 mm to 40 mm (~1.02 in to ~1.57 in) and free lengths from 20 mm to 305 mm (~0.79 in to ~12.0 in). The wire material is spring steel with a surface finish suited for general mechanical environments; corrosion-resistant variants are available — contact us to confirm. Sold in packs of 2 or 5 pieces depending on the size selected.
Typical use cases include compression spring for CNC router Z-axis return, heavy-duty compression spring for industrial fixture clamping, and large OD compression spring for automation press tooling. The wide size matrix lets you match the exact free length and OD to your bore or rod without custom tooling.
Thick 2.5mm wire cross-section delivers higher load capacity and improved resistance to permanent set compared to lighter wire springs in the same OD range.
OD options from 26 mm to 40 mm paired with free lengths from 20 mm to 305 mm give you precise fitment without custom fabrication or shimming.
Wound from spring steel wire for consistent elastic modulus and fatigue life across repeated compression cycles in mechanical and automation environments.
Available in 5-piece packs for shorter lengths and 2-piece packs for longer lengths (120 mm–305 mm), so you order exactly what your project requires.
Springs in this OD and wire range are typically manufactured with closed ends to provide a flat seating surface for consistent load transfer in bored housings or on guide rods.
Suited for CNC Z-axis return, fixture clamping, press tooling, valve mechanisms, and general mechanical assemblies where a large-diameter, heavy-wire compression spring is required.
| Wire Diameter | 2.5 mm |
|---|---|
| Outer Diameter (OD) Range | 26 mm – 40 mm (approx. 1.02 in – 1.57 in) |
| Free Length Range | 20 mm – 305 mm (approx. 0.79 in – 12.0 in) |
| Material | Spring Steel |
| End Type | See variant options |
| Surface Finish | See variant options |
| Spring Rate | See variant options |
| Load Capacity | See variant options |
| Pack Quantity | 2 pcs (lengths ≥120 mm) / 5 pcs (lengths ≤100 mm) |
| Coil Direction | Right-hand (typical) |
Measure the bore (inner diameter of the housing) or the guide rod OD. For a bore-mounted spring, the spring OD should be 0.5–1.5 mm smaller than the bore. For a rod-guided spring, the spring inner diameter (ID = OD − 2 × wire diameter) should be 0.5–1.5 mm larger than the rod. Select a free length approximately 20–30% longer than your desired compressed working length to ensure adequate preload and travel.
Load capacity depends on OD, free length, number of active coils, and material. The 2.5mm wire gauge provides significantly higher load ratings than 1.5–2.0mm wire springs of the same OD. For exact spring rate and maximum load values for your selected variant, please contact us to confirm — we can provide the specification sheet for the specific size.
The standard material is carbon spring steel, which offers good mechanical properties but limited corrosion resistance in wet or chemically aggressive environments. For outdoor, marine, or humid applications, a stainless steel or zinc-plated variant is recommended. Please contact us to confirm availability of corrosion-resistant options for your required size.
Yes. The OD range of 26–40 mm covers many standard bore sizes used in industrial fixtures, CNC machines, and automation tooling. The inner diameter (ID) of each spring equals OD minus twice the wire diameter (2.5 mm × 2 = 5 mm), so a 30 mm OD spring has an ID of approximately 25 mm. Verify your bore and rod dimensions against the selected variant before ordering.
Springs with free lengths of 120 mm and above are heavier and bulkier per unit. The 2-piece pack format keeps the order weight and packaging size manageable while still providing a spare for most single-machine applications. If you need larger quantities, please contact us for bulk pricing.
A larger OD with the same wire diameter and length will generally have fewer active coils, resulting in a stiffer spring (higher spring rate). If you need a softer spring with more travel, choose a smaller OD or longer free length. If you need a stiffer spring with higher load at the same deflection, choose a larger OD. Match the OD first to your bore or rod constraint, then select the length for the required travel and preload.
Standard carbon spring steel retains its mechanical properties up to approximately 120°C (248°F). For applications above this temperature — such as oven fixtures, engine bays, or industrial furnaces — a high-temperature alloy spring steel or Inconel variant is required. Contact us to confirm suitability for your operating temperature.
