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When a project demands consistent, repeatable push-back force in a compact footprint, finding the right compression spring can be frustrating. Undersized springs collapse under load; oversized ones won't fit the bore. Engineers, hobbyists, and repair technicians who work with small-scale mechanisms need a dependable range of 2mm wire diameter compression springs they can select by outer diameter and free length without guesswork.
These compression springs feature a 2mm wire diameter wound from spring steel, with outer diameters (OD) ranging from 11mm to 40mm (~0.43 in to 1.57 in) and free lengths from 15mm to 50mm (~0.59 in to 1.97 in). Each variant is sold in a pack of 10 pieces, giving you spares for prototyping or batch assembly.
Typical use cases include DIY mechanical linkages requiring a 2mm wire spring steel coil spring, robotics actuator return mechanisms needing a small OD compression spring, and appliance or fixture repair calling for a replacement pressure spring in the 15–50mm free length range.
Wound from spring steel wire for consistent elastic modulus and reliable return force across repeated compression cycles.
Uniform 2mm wire cross-section across all variants ensures predictable spring rate and structural integrity under axial load.
Outer diameters from 11mm to 40mm (0.43–1.57 in) cover a broad spectrum of bore sizes for small-to-medium mechanical assemblies.
Free lengths from 15mm to 50mm (0.59–1.97 in) let you match stroke requirements without custom fabrication.
Each order ships as a 10-piece set — enough for prototyping, batch builds, or keeping spares on hand for maintenance.
Closed and ground ends (typical for this spring type) provide flat seating surfaces for stable axial alignment in spring pockets.
| Wire Diameter | 2mm (0.079 in) |
|---|---|
| Outer Diameter (OD) | 11mm – 40mm (0.43 in – 1.57 in) — See variant options |
| Free Length | 15mm – 50mm (0.59 in – 1.97 in) — See variant options |
| Material | Spring Steel |
| Spring Type | Compression (Coil) |
| End Type | See variant options |
| Surface Finish | See variant options |
| Quantity per Pack | 10 Pieces |
| Spring Rate | See variant options |
| Max Load Capacity | See variant options |
Measure the bore or housing inner diameter your spring must fit inside — the spring OD should be slightly smaller than the bore to allow free movement. Then measure the available cavity depth and your required compressed length to determine the free length you need. Select the variant whose OD and free length best match those measurements.
Spring rate depends on wire diameter, OD, free length, and number of active coils — all of which vary by variant. Because each size combination produces a different spring rate, please contact us to confirm the rate for your specific variant before ordering for load-critical applications.
Spring steel offers good mechanical properties but has limited inherent corrosion resistance compared to stainless steel. For environments with moisture, chemicals, or outdoor exposure, consider applying a protective coating after installation or contact us to inquire about stainless steel alternatives.
Spring steel retains its elastic properties well at room temperature and moderate heat. For sustained elevated temperatures (generally above 120°C / 250°F), spring properties may degrade over time. Contact us to confirm suitability for your specific temperature range.
Yes — the range of OD options (11–40mm) covers many standard spring pocket sizes used in plunger assemblies, jigs, fixtures, and mechanical linkages. Verify the OD of your chosen variant against your pocket diameter to ensure proper fit and alignment.
A longer free length provides more stroke (travel distance before the spring is fully compressed) and typically a lower spring rate for the same wire and OD. Choose a longer free length when you need more travel or softer force buildup; choose a shorter free length when space is limited or you need a stiffer response over a short stroke.
The current listing is configured for 10-piece packs. If you need a different quantity, please contact us through the store — we may be able to accommodate custom quantity requests depending on availability.
