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Engineers, makers, and repair technicians often struggle to find small-diameter compression springs that hold their rated load without corroding or fatiguing prematurely. These 304 stainless steel compression springs with a 0.8mm wire diameter and 8mm outer diameter are engineered for consistent elastic return and long service life in demanding environments.
Each spring is cold-wound from 304 stainless steel wire (wire diameter: 0.8mm / 0.031 in; outer diameter: 8mm / 0.315 in; inner diameter: approximately 6.4mm / 0.252 in). Free lengths span from 10mm (0.39 in) up to 305mm (12.0 in) across the available size variants, giving you precise control over travel and load characteristics.
Typical applications include CNC machine tool return mechanisms, robotic joint preloading, electronic device button actuation, vibration isolation mounts, and precision instrument assemblies — all scenarios where a compact, corrosion-resistant compression spring is essential.
Cold-wound from 304-grade stainless wire for solid corrosion resistance in humid, mildly acidic, or outdoor environments.
Consistent wire gauge across the full length ensures uniform spring rate and predictable deflection behavior under load.
Compact OD fits standard small-bore housings and guide rods, making these springs drop-in compatible with many existing assemblies.
Choose from 19 free-length options to match your exact stroke and load requirements without custom fabrication.
Helical coil geometry absorbs and dissipates oscillating forces, reducing transmitted vibration in mechanical assemblies.
Available in packs from 1 to 140 pieces — order exactly what your project needs, from prototyping to small-batch production.
| Material | 304 Stainless Steel |
|---|---|
| Wire Diameter (WD) | 0.8mm (0.031 in) |
| Outer Diameter (OD) | 8mm (0.315 in) |
| Inner Diameter (ID) | ~6.4mm (~0.252 in) |
| Free Length (L) | 10mm – 305mm (0.39 in – 12.0 in); see variant options |
| Spring Rate | See variant options |
| End Type | Closed & ground (standard) |
| Wind Direction | Right-hand |
| Surface Finish | Natural (uncoated stainless) |
| Quantity per Pack | See variant options (1–140 pcs) |
Measure the distance between the spring seats when the assembly is at rest (free length) and when fully compressed (solid height). Select a spring whose free length is equal to or slightly longer than your required travel plus solid height. For vibration damping, a longer free length generally provides a softer spring rate.
The load capacity depends on the free length and number of active coils. Shorter springs with fewer coils are stiffer and handle higher loads per unit of deflection. For exact load-deflection data, contact us with your required free length and we can provide the spring rate estimate.
304 stainless steel offers good resistance to atmospheric corrosion, fresh water, and mild chemical exposure. For highly saline or strongly acidic environments, consider 316 stainless steel instead. These springs are not recommended for continuous immersion in chlorinated water or strong acids.
For a guide rod inside the spring, use a rod diameter of approximately 5.5–6mm to allow free movement without binding. For a bore housing the spring, the bore should be at least 8.2–8.5mm to prevent the spring from dragging on the wall during compression.
Yes. The shorter length variants (10–30mm) are well-suited for tactile button return mechanisms, keyboard switches, and small actuator assemblies. The consistent wire diameter ensures repeatable actuation force across a production batch.
For prototyping or single-unit repairs, small packs (1–10 pcs) are the most economical. For small-batch production runs or assembly lines, larger packs (50–140 pcs) reduce per-unit cost. Select your size and quantity combination from the variant dropdowns above.
The 305mm (12-inch) variant is a full-length spring rod suitable for cutting to custom lengths or for applications requiring long travel, such as suspension mechanisms or extended-stroke actuators. Shorter variants are pre-sized for compact assemblies and require no cutting.
