Stainless Steel Compression Springs Steel wire 0.1 mm small coil spring 5-20mm

Measure the bore or housing your spring will sit in and select an OD that is 0.1–0.2 mm smaller than the bore for a sliding fit. For free length, choose a spring that is 20–30% longer than your required compressed height to stay within the elastic range and avoid set.

At 0.1 mm wire diameter, spring rates are in the millinewton-per-millimeter range — suitable for light-touch contacts, pen clicks, and sensor return mechanisms. Exact spring rate depends on OD and free length; contact us if you need calculated values for a specific variant.

Yes. Stainless steel wire provides good resistance to oxidation and mild corrosion in humid or lightly wet environments. For aggressive chemical exposure or salt-spray conditions, verify compatibility with your specific environment before use.

Yes. The small OD (0.8–1.4 mm) and fine wire make these springs well-suited for PCB contact springs, battery contacts, and SMT-adjacent mechanisms. Stainless steel is non-magnetic, which is beneficial in sensitive electronic environments.

For initial prototyping and fit-testing, the 2 pcs or 20 pcs packs are ideal. Once your design is validated, the 100, 200, 240, or 300 pcs packs offer a lower per-unit cost for small-batch production runs.

These are closed-end compression springs, which provides a flat seating surface for consistent load application and stable positioning in bores or on posts.

The inner diameter equals the outer diameter minus twice the wire diameter. For example, OD 0.8 mm − 2 × 0.1 mm = 0.6 mm ID; OD 1.4 mm − 0.2 mm = 1.2 mm ID. Use this to size any guide post your spring will slide over.