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When a project demands reliable spring force in a tight space, finding the right compression spring can be frustrating. Whether you are repairing a precision instrument, building a custom jig, or prototyping a mechanical assembly, these stainless steel compression springs deliver consistent, repeatable performance across a wide range of loads and travel distances.
Each spring is formed from stainless steel wire in three wire diameters — 0.2 mm (~0.008 in), 0.3 mm (~0.012 in), and 0.4 mm (~0.016 in) — with outer diameters ranging from 1.5 mm to 12 mm (~0.06 in to ~0.47 in) and free lengths from 5 mm to 305 mm (~0.2 in to ~12 in). The stainless steel construction provides corrosion resistance suitable for indoor mechanical assemblies, electronics enclosures, and light-duty outdoor applications.
These small compression springs are well suited for electronics repair and PCB contact applications, pen and stylus mechanisms, miniature valve and actuator assemblies, and precision hobby or maker projects requiring consistent spring-back force.
Available in 0.2 mm, 0.3 mm, and 0.4 mm wire diameters to match a wide range of load and deflection requirements.
Outer diameters from 1.5 mm to 12 mm and free lengths from 5 mm to 305 mm give you flexibility across many applications.
Corrosion-resistant stainless steel wire maintains spring properties in humid or mildly corrosive environments.
Tightly wound coils ensure repeatable compression and reliable spring-back across the rated travel range.
Choose from packs of 1, 5, or 10 pieces depending on your project needs — no need to over-order.
Ideal for electronics, instrumentation, pen mechanisms, and other applications where space is at a premium.
| Material | Stainless Steel |
|---|---|
| Wire Diameter | 0.2 mm / 0.3 mm / 0.4 mm |
| Outer Diameter | 1.5 mm – 12 mm (see variant options) |
| Free Length | 5 mm – 305 mm (see variant options) |
| Spring Type | Compression (closed ends) |
| Finish | Natural stainless |
| Pack Quantity | 1 / 5 / 10 pieces (see variant options) |
| Spring Rate | See variant options |
| Weight | See variant options |
Wire diameter determines the stiffness (spring rate) of the spring. A thicker wire (0.4 mm) produces a stiffer spring with higher load capacity, while a thinner wire (0.2 mm) gives a softer, more compliant spring. Match the wire diameter to your required load and deflection — if you need light touch force (e.g., a pen click), start with 0.2 mm; for firmer mechanical return force, try 0.3 mm or 0.4 mm.
Wire diameter is the thickness of the steel wire used to wind the spring. Outer diameter is the overall width of the coiled spring body. When fitting a spring into a bore or over a shaft, use the outer diameter to check clearance. The wire diameter affects spring rate and load capacity.
Yes. These springs are made from stainless steel, which offers good resistance to rust and oxidation in typical indoor and mildly humid environments. They are suitable for electronics enclosures, light mechanical assemblies, and hobby projects. For highly corrosive or submerged environments, please verify the specific stainless grade meets your requirements.
These small compression springs are commonly used in pen and stylus mechanisms, PCB contact points, miniature valve assemblies, precision instruments, hobby robotics, 3D printer components, and general DIY mechanical projects. Their small size makes them ideal wherever space is limited but reliable spring force is needed.
Free length is the uncompressed length of the spring. Choose a free length that is longer than your required compressed length by at least the travel distance you need. For example, if you need 10 mm of travel and the spring will be compressed to 5 mm, select a free length of at least 15 mm. Always leave some margin to avoid fully compressing (solid height) the spring.
Stainless steel provides better outdoor durability than carbon steel springs. These springs can handle light outdoor exposure such as in enclosures or covered assemblies. Prolonged exposure to salt spray or standing water may eventually affect performance, so consider a protective coating or enclosure for harsh outdoor environments.
Pack quantity varies by variant — options include 1 piece, 5 pieces, or 10 pieces. The quantity is shown in the "Length & Amount" variant selector (e.g., "30mm & 10Pcs" means a 30 mm free length spring in a pack of 10). Select the quantity that matches your project needs before adding to cart.
