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When a mechanism fails because a spring loses tension, collapses under load, or corrodes in a damp environment, the entire assembly is compromised. Engineers, makers, and repair technicians who need a dependable, dimensionally consistent compression spring for CNC fixtures, robotics actuators, electronic enclosures, or general DIY assemblies will find this range covers the most common specifications in one listing.
Each spring has a free length of 20mm (approximately 0.79 in) and is available in outer diameters from 8mm to 45mm (roughly 0.31–1.77 in), with wire diameters spanning 1.4mm to 4mm (0.055–0.157 in). Two material grades are offered: 304 stainless steel for corrosion-resistant applications and carbon spring steel for higher-load, cost-sensitive uses. Quantity options range from 1 piece to 10 pieces per order.
Typical use cases include compression spring for 3D printer bed leveling, small compression spring for electronics enclosure latches, and replacement compression spring for mechanical keyboard switches or valve assemblies.
| Free Length | 20 mm (0.79 in) |
|---|---|
| Outer Diameter Range | 8 mm – 45 mm (0.31 – 1.77 in) |
| Wire Diameter Range | 1.4 mm – 4 mm (0.055 – 0.157 in) |
| Material Options | 304 Stainless Steel / Carbon Spring Steel |
| End Type | Closed & Ground (flat ends) |
| Spring Rate | See variant options |
| Load Capacity | See variant options |
| Surface Finish | Natural / Uncoated |
| Quantity per Pack | 1 / 2 / 3 / 5 / 10 pcs (see variant options) |
| Application | CNC fixtures, robotics, electronics, DIY mechanisms |
Measure the bore or housing your spring will sit inside and subtract 0.5–1mm for clearance. For example, if your bore is 12mm, select the 11mm or 12mm outer diameter variant. Always confirm the fit with your assembly drawings before ordering in bulk.
304 stainless steel offers good corrosion resistance and is suitable for humid, outdoor, or food-adjacent environments. Carbon spring steel typically provides a higher spring rate and is more cost-effective for dry, indoor applications where corrosion is not a concern.
The stainless steel variants (304 grade) resist rust and oxidation in most outdoor and humid environments. The carbon spring steel variants are not corrosion-resistant and should be used in dry, protected locations or coated after installation if moisture exposure is expected.
Yes. The smaller diameter variants (8–12mm OD, 1.4–1.6mm wire) are commonly used in 3D printer bed leveling assemblies and mechanical keyboard switch modifications. Match the outer diameter to your spring seat and verify the free length of 20mm suits your travel requirement.
For prototyping or single repairs, the 1–3 piece packs are ideal to test fit and function before committing. For small production runs or to keep spares on hand, the 10-piece packs offer better per-unit value. Select the quantity option that matches your project scale.
A larger wire diameter produces a stiffer spring with a higher spring rate. For heavier loads, choose variants with wire diameters of 2.5mm, 3mm, 3.5mm, or 4mm. For light-duty or precision applications requiring low force, the 1.4mm–1.8mm wire diameter variants are more appropriate.
Yes, provided you match the free length (20mm), outer diameter, and wire diameter of the original spring. If the original spring rate is known, select the wire diameter closest to the original. When in doubt, order a small pack to test before replacing all springs in a machine.
