0.2mm-0.5mm Wire Dia 304 Stainles Steel Compression Spring Pressure Small Spring

Start with the bore or housing diameter your spring must fit inside — the spring's outer diameter should be 0.1 mm to 0.3 mm smaller than the bore for a sliding fit. Then select a wire diameter that provides the load and deflection you need: thicker wire (e.g., 0.5 mm) gives a stiffer spring, while thinner wire (e.g., 0.2 mm) gives a softer, more compliant spring. If you are unsure, contact us to confirm before ordering.

Spring rate varies by wire diameter, outer diameter, free length, and number of active coils. Because this listing covers a wide range of size combinations, the spring rate differs per variant. As a general guide, springs with larger wire-to-outer-diameter ratios and shorter free lengths will be stiffer. For specific spring rate data on a particular variant, please contact us with your size selection.

Yes. 304 stainless steel offers good resistance to atmospheric corrosion, fresh water, and mild chemical exposure. It is suitable for outdoor use, humid environments, and light industrial applications. For highly aggressive environments (saltwater immersion, strong acids), consider 316 stainless steel instead. These springs are not recommended for prolonged submersion in chlorinated water.

These springs are widely used in precision instruments, pen and stylus mechanisms, electronic push-button switches, miniature robotics joints, camera shutter assemblies, medical device components, jig and fixture clamping, and small-batch prototype builds. Their small wire diameters make them especially suitable for space-constrained designs where standard springs are too large.

The format is: Wire Diameter × Outer Diameter × Free Length, all in millimeters. For example, 0.3*3.0*10mm means a wire diameter of 0.3 mm, an outer diameter of 3.0 mm, and a free length of 10 mm. Select the variant that matches your required dimensions before adding to cart.

304 stainless steel retains its mechanical properties across a typical operating range of –20°C to +200°C (–4°F to +392°F). For continuous exposure above 200°C, spring relaxation (set) may occur over time, reducing the effective spring force. If your application involves sustained high temperatures, please contact us to discuss material alternatives.

The listed variants cover a broad range of wire diameters, outer diameters, and free lengths. If you need a size combination not shown, or require quantities larger than the standard 10-piece packs, please contact us directly. We can advise on availability and lead times for custom or bulk orders.