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When a project demands consistent return force and dimensional accuracy, a mismatched spring can derail the entire build. Whether you are a hobbyist assembling a custom mechanism, a maker prototyping a device, or a technician replacing a worn component, having the right compression spring on hand is non-negotiable. These 200mm stainless steel compression springs are engineered to deliver reliable elastic performance across a wide range of wire and outer diameter combinations.
Each spring is wound from stainless steel wire in diameters ranging from 0.3mm to 2mm (approximately 0.012 in to 0.079 in), with outer diameters spanning 3mm to 25mm (approximately 0.12 in to 0.98 in). The free length is a uniform 200mm (approximately 7.87 in). The stainless steel construction provides inherent corrosion resistance and maintains spring characteristics across a broad temperature range.
These 200mm compression springs suit a variety of use cases: replacing worn return springs in small appliances and tools, providing preload force in custom jigs and fixtures, acting as buffer elements in lightweight mechanical assemblies, and serving as tension-balancing components in DIY robotics or automation projects where a compact stainless steel small spring with a precise wire-to-outer-diameter ratio is required.
Wire diameters from 0.3mm to 2mm paired with outer diameters from 3mm to 25mm give you precise control over spring rate and load capacity for your specific application.
Wound from stainless steel wire, these springs resist oxidation and surface corrosion, making them suitable for humid environments and applications where carbon steel would degrade.
A consistent 200mm (7.87 in) free length across all variants simplifies design calculations and allows direct substitution in existing assemblies without re-engineering the housing.
Thicker wire diameters (up to 2mm) deliver higher spring rates for load-bearing applications, while finer wires (0.3mm–0.5mm) provide gentle, precise return forces for delicate mechanisms.
Available in 1-piece, 2-piece, and 4-piece packs so you can order exactly what your project needs — from a single replacement to a small batch for prototyping or repair stock.
Springs in this size range are typically wound with closed ends to provide a flat seating surface, improving stability and load distribution when installed in a bore or over a rod.
| Material | Stainless Steel |
|---|---|
| Free Length | 200mm (approx. 7.87 in) |
| Wire Diameter | 0.3mm – 2mm (0.012 in – 0.079 in) |
| Outer Diameter | 3mm – 25mm (0.12 in – 0.98 in) |
| Spring Rate | See variant options |
| Load Capacity | See variant options |
| End Type | Closed (typical for this size range) |
| Surface Finish | Natural stainless steel |
| Pack Quantity | 1 Pcs / 2 Pcs / 4 Pcs (see variant options) |
| Spring Type | Compression |
Start with the bore or rod diameter in your assembly. The outer diameter of the spring should be slightly smaller than the bore (for bore-guided springs) or the inner diameter should be slightly larger than the rod (for rod-guided springs). Then select the wire diameter based on the load you need: thicker wire (e.g., 1.5mm–2mm) produces a stiffer spring with higher load capacity, while thinner wire (e.g., 0.3mm–0.6mm) gives a softer, more compliant spring. Use the variant selector above to match both dimensions to your design.
Load capacity depends on the specific wire diameter and outer diameter combination you select. Larger wire diameters relative to the outer diameter produce higher spring rates and load capacities. For precise load calculations, apply the standard spring rate formula: k = (G × d⁴) / (8 × D³ × n), where G is the shear modulus of stainless steel (approximately 69–75 GPa), d is the wire diameter, D is the mean coil diameter, and n is the number of active coils. Contact us if you need assistance selecting the right variant for a specific load requirement.
Yes. Stainless steel provides significantly better corrosion resistance than carbon steel or music wire springs. These springs are suitable for humid indoor environments, light outdoor exposure, and applications where occasional moisture contact is expected. For continuous immersion in saltwater or aggressive chemical environments, verify the specific stainless steel grade meets your requirements or contact us for clarification.
These springs follow standard coil spring geometry and are compatible with any housing or rod that matches the selected outer diameter and wire diameter. The 200mm free length is a common size used in many mechanical assemblies. Always verify the bore diameter, rod diameter, and required compressed length against your assembly drawings before ordering.
All pack options contain identical springs — the only difference is quantity. The 1-piece pack is ideal for a single replacement or trial fit. The 2-piece and 4-piece packs offer better value per spring and are suited for projects requiring multiple springs, repair stock, or prototyping where you may need spares. Select the pack size that matches your project needs using the "Length & Amount" variant selector.
Measure the free length (uncompressed end-to-end), the outer diameter (widest point across the coils), and the wire diameter (thickness of the wire itself) using calipers. Compare these three measurements to the variant options listed above. The free length for all variants in this listing is 200mm. Select the outer diameter and wire diameter that match your measurements most closely.
Stainless steel springs generally retain their mechanical properties up to approximately 250–300°C (480–570°F) depending on the alloy grade, which is significantly better than carbon steel springs. For applications involving continuous elevated temperatures, confirm the operating temperature range with us before ordering to ensure the specific grade used meets your requirements.
