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When a worn-out spring causes equipment downtime or a DIY project stalls because the right size is nowhere to be found, engineers and makers alike need a dependable source for precision compression springs. These 3mm wire diameter compression springs are designed for hobbyists, maintenance technicians, and mechanical engineers who demand consistent spring force and dimensional accuracy across a wide size range.
Each spring is formed from 3mm (0.118 in) round wire, with outer diameters spanning 16–40mm (0.63–1.57 in) and free lengths from 20–200mm (0.79–7.87 in). The coil body is wound from spring steel, delivering firm, repeatable compression under cyclic loading. Finish is typically a bright or lightly oiled steel surface to resist surface oxidation during storage and use.
Typical applications include compression spring replacement for industrial machinery actuators, automotive hood and trunk lid mechanisms, furniture and cabinet hardware, 3D printer Z-axis tensioning, and custom jig-and-fixture builds requiring controlled return force.
Consistent 3.0mm (0.118 in) wire gauge across all variants for predictable spring rate and load capacity.
OD 16–40mm and free length 20–200mm — one listing covers dozens of standard spring seat sizes.
Wound from spring steel wire for firm, repeatable compression and long fatigue life under cyclic loads.
Bright or lightly oiled finish reduces surface oxidation during storage and in low-humidity environments.
Ends are typically closed and ground for flat, stable seating on spring plates and in blind bores.
Used in machinery, automotive, furniture hardware, 3D printers, and custom jig-and-fixture builds.
| Wire Diameter | 3mm (0.118 in) |
|---|---|
| Outer Diameter (OD) | 16–40mm (0.63–1.57 in) — see variant options |
| Free Length | 20–200mm (0.79–7.87 in) — see variant options |
| Material | Spring steel |
| Surface Finish | Bright / lightly oiled |
| End Type | Closed and ground (typical) |
| Coil Direction | Right-hand (typical) |
| Spring Rate | See variant options |
| Load Capacity | See variant options |
| Quantity per Order | 1 Pcs (per variant selected) |
Measure the spring seat bore (inner diameter of the housing) — your spring OD should be 0.5–1.5mm smaller than the bore for a sliding fit. For free length, measure the uncompressed gap your spring must fill, then add 20–30% to allow working travel. Use the variant selector above to match OD and free length to your measurements.
Load capacity depends on the specific OD and free length combination. Larger OD and shorter free length generally produce a stiffer spring with higher load capacity. For exact spring rate and load data for your chosen variant, contact us to confirm before ordering for critical load-bearing applications.
These springs are made from spring steel with a bright or lightly oiled finish, which provides basic surface protection against oxidation during storage and in dry indoor environments. For outdoor, marine, or high-humidity applications, consider adding a protective coating or using stainless steel springs instead. Contact us if you need corrosion-resistant variants.
These compression springs are general-purpose and fit any application with a spring seat sized for 16–40mm OD springs. Common uses include industrial machinery actuators, automotive hood and trunk lid mechanisms, furniture and cabinet hardware, 3D printer Z-axis assemblies, and custom jig-and-fixture builds. Always verify OD, free length, and spring rate match your equipment's specification.
Each variant is sold individually (1 Pcs per order by default). This makes it easy to source an exact replacement without committing to a large quantity. If you need multiple pieces of the same size, simply adjust the quantity in your cart before checkout.
Spring rate is determined by wire diameter, OD, and number of active coils. Because this listing covers a wide range of OD and length combinations, exact spring rate values vary by variant. If your application requires a specific spring rate (N/mm or lbf/in), please contact us with your OD, free length, and required rate so we can confirm the best match.
Free length is the overall length of the spring when no load is applied — this is the dimension listed in the variant name (e.g., "20mm x 30mm" means 20mm OD × 30mm free length). Compressed length (solid height) is the minimum length when all coils are touching. Always ensure your application allows the spring to operate between its free length and solid height without bottoming out.
