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When a project demands reliable, repeatable push-back force — whether you are repairing a mechanism that keeps losing tension or prototyping a new actuator that needs consistent spring rate — finding a compression spring in exactly the right wire diameter and outer diameter can be the difference between a working assembly and a frustrating rework. These compression springs are designed for engineers, hobbyists, and repair technicians who need a broad selection of precisely wound coil springs without ordering custom tooling.
Each spring is wound from round wire ranging from 0.2 mm to 3 mm in diameter, with outer diameters spanning 1.2 mm to 40 mm and free lengths of 120 mm, 200 mm, or 300 mm (approximately 4.7 in, 7.9 in, or 11.8 in). Material options include carbon spring steel, 304 stainless steel, and galvanized steel, covering a wide range of load, corrosion, and temperature requirements.
Typical use cases include compression spring replacement in consumer electronics and appliances, return-force elements in jigs and fixtures for small-batch manufacturing, load-bearing springs in 3D-printer extruder assemblies, and tension-balancing components in custom robotics and automation rigs.
Wire diameters from 0.2 mm to 3 mm paired with outer diameters from 1.2 mm to 40 mm give you over 200 size combinations to match your exact bore and load spec.
Carbon spring steel for general-purpose load cycling, 304 stainless steel for corrosion-sensitive environments, and galvanized steel for outdoor or humid conditions.
Available in 120 mm (~4.7 in), 200 mm (~7.9 in), and 300 mm (~11.8 in) free lengths, allowing you to cut-to-length or use as-is depending on your travel requirement.
Uniform coil pitch throughout the body ensures even load distribution and predictable deflection behavior across the full compression stroke.
Stainless steel and galvanized variants resist oxidation in wet, marine, or chemically active environments where bare carbon steel would degrade.
From micro-springs in electronics (0.2 mm wire / 1.2 mm OD) to heavy-duty return springs (3 mm wire / 40 mm OD), one listing covers prototyping through production needs.
| Spring Type | Cylindrical Compression Spring |
|---|---|
| Wire Diameter Range | 0.2 mm – 3 mm (0.008 in – 0.118 in) |
| Outer Diameter Range | 1.2 mm – 40 mm (0.047 in – 1.575 in) |
| Free Length Options | 120 mm / 200 mm / 300 mm (4.7 in / 7.9 in / 11.8 in) |
| Material Options | Carbon Spring Steel / 304 Stainless Steel / Galvanized Steel |
| End Type | See variant options |
| Surface Finish | Natural (spring steel & stainless) / Zinc-galvanized |
| Spring Rate | See variant options |
| Load Capacity | See variant options |
| Operating Temperature | Spring Steel: typically –40 °C to +120 °C; Stainless: typically –60 °C to +200 °C |
| Coil Direction | Right-hand wound (standard) |
| Quantity per Order | 1 piece per variant |
Start with the bore or guide-pin diameter in your assembly. The spring's outer diameter should be 0.5 mm – 1 mm smaller than the bore ID to allow free movement without binding. Then select a wire diameter that delivers the spring rate you need — thicker wire produces a stiffer spring for the same OD and free length. If you are unsure, select a mid-range wire diameter (0.5 mm – 1 mm) and test deflection before committing to a larger order.
Carbon spring steel offers a higher tensile strength-to-cost ratio and is ideal for dry, indoor environments where corrosion is not a concern. Stainless steel (304 grade) provides significantly better corrosion resistance and is suitable for wet, marine, food-adjacent, or mildly acidic environments. Stainless springs also maintain their properties at slightly higher temperatures. If your application involves moisture or chemical exposure, choose stainless steel.
Galvanized springs have a zinc coating applied over carbon spring steel, providing a moderate level of corrosion protection at a lower cost than stainless steel. They are a practical choice for outdoor or humid environments where full stainless steel is not required. Note that the zinc coating adds a small amount to the outer diameter — typically 0.02 mm – 0.05 mm — so account for this when fitting into tight bores.
Yes. Compression springs can be cut to a shorter free length using a rotary tool or spring cutter. After cutting, the end coil may need to be ground flat to restore a closed-end profile for stable seating. Keep in mind that cutting changes the number of active coils and therefore alters the spring rate — a shorter spring from the same wire and OD will be stiffer. Plan your cut length with this in mind.
Yes, provided the printed bore or guide-pin diameter matches the selected spring OD with appropriate clearance (typically 0.3 mm – 0.8 mm). FDM-printed seats may have slight dimensional variation, so we recommend selecting a spring OD 0.5 mm – 1 mm smaller than your nominal bore to ensure smooth travel. Stainless steel variants are recommended for applications near heated beds or enclosures above 60 °C.
Spring rate (k) can be estimated using the formula: k = (G × d⁴) / (8 × D³ × n), where G is the shear modulus (~80 GPa for spring steel, ~70 GPa for stainless), d is wire diameter, D is mean coil diameter (OD minus wire diameter), and n is the number of active coils. For a quick estimate, contact us with your selected variant's wire diameter, OD, and free length and we can provide a calculated spring rate range.
The inner diameter is approximately equal to the outer diameter minus twice the wire diameter. For example, a spring with a 10 mm OD and 1 mm wire diameter has an ID of approximately 8 mm. Use this to verify that your guide pin will fit inside the spring with a small clearance (typically 0.2 mm – 0.5 mm) to prevent binding during compression.
Each order includes 1 piece of the selected variant (wire diameter × outer diameter × length & material combination). If you need multiple pieces, simply increase the quantity in your cart. For bulk or wholesale inquiries, please contact us directly.
