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When a standard spring is too large for your application, finding a reliable miniature compression spring becomes a real challenge. Engineers, watchmakers, electronics repair technicians, and precision instrument builders need springs that hold consistent force in extremely tight spaces — and a wrong-sized spring means a failed assembly. These stainless steel mini compression springs are engineered for exactly those demanding, small-scale applications.
Each spring is formed from stainless steel wire with a diameter of either 0.2mm (~0.008 in) or 0.25mm (~0.010 in). Outer diameters range from 1.5mm to 4mm (~0.059–0.157 in), and free lengths span 5mm to 50mm (~0.197–1.969 in). Available in packs of 10 or 50 pieces to suit both prototyping and production runs.
Typical use cases include miniature compression springs for electronics assemblies, micro spring replacements in precision instruments, and small compression springs for watch repair and pen mechanisms. Whether you need a 0.2mm wire diameter compression spring for a sensor housing or a 0.25mm wire spring for a medical device prototype, these cover a wide range of micro-engineering needs.
Available in 0.2mm and 0.25mm wire diameters, enabling use in the most compact assemblies where standard springs simply won't fit.
Outer diameters from 1.5mm to 4mm and free lengths from 5mm to 50mm give you precise dimensional control across a broad range of micro-engineering applications.
Formed from stainless steel wire for corrosion resistance and consistent spring-back performance, suitable for humid or mildly corrosive environments.
Choose 10-piece packs for prototyping or 50-piece packs for production and repair stock — both options available across all size combinations.
Uniform coil pitch and closed ends ensure predictable load characteristics and stable seating in bores or on posts during assembly.
Dimensional tolerances suited for precision instruments, medical device prototyping, electronics, and watchmaking where spring performance directly affects function.
| Material | Stainless Steel |
|---|---|
| Wire Diameter | 0.2mm / 0.25mm (see variant options) |
| Outer Diameter | 1.5mm / 2mm / 2.5mm / 3mm / 4mm (see variant options) |
| Free Length | 5mm – 50mm (see variant options) |
| Quantity per Pack | 10 pcs or 50 pcs (see variant options) |
| Spring Type | Compression |
| End Type | Closed ends (typical for this wire diameter range) |
| Coil Direction | Right-hand (standard) |
| Corrosion Resistance | Suitable for general indoor and mildly humid environments |
| Weight | See variant options |
Measure the bore or housing your spring will sit in and select an outer diameter slightly smaller than that bore. For free length, choose a spring that is longer than your required compressed height to ensure adequate preload. If you are unsure, start with a 10-piece pack to test fit before ordering a 50-piece production quantity.
A thicker wire diameter (0.25mm) produces a stiffer spring with higher load capacity for the same outer diameter and length. The 0.2mm wire springs are softer and better suited for very light-load applications such as contact switches or pen mechanisms. Choose based on the force your application requires.
Yes. These springs are made from stainless steel, which provides good resistance to oxidation and mild corrosion in typical indoor environments. They are suitable for electronics, instruments, and general mechanical assemblies. For highly aggressive chemical environments, please contact us to confirm suitability.
These stainless steel compression springs are commonly used in prototype and R&D applications for medical devices due to their small size and corrosion resistance. However, for regulated medical production use, please verify material certifications and compliance requirements with your engineering team before specifying.
For 0.2mm wire diameter, outer diameters of 1.5mm, 2mm, 2.5mm, 3mm, and 4mm are available. The ratio of wire diameter to outer diameter affects spring index and performance. A 0.2mm wire with a 1.5mm outer diameter gives a tighter coil, while a 4mm outer diameter gives a more open coil with lower stiffness per unit length.
Order 10-piece packs when you are prototyping, testing fit, or need only a small quantity for a repair job. The 50-piece packs offer better value per spring and are ideal for production runs, stocking a repair workshop, or when you know the size works for your application.
Spring rate depends on the specific combination of wire diameter, outer diameter, free length, and number of active coils. Because this product covers a wide matrix of sizes, spring rate varies by variant. If you need a specific spring rate for your design, please contact us with your dimensional requirements and we can advise on the closest match.
