304 Stainless Steel Compression Spring Wire Dia 3.5mm, L 20-100mm, OD 20-50mm

Measure the bore or housing your spring will sit in and select an OD slightly smaller than the bore diameter for a sliding fit, or slightly larger than a shaft for an over-shaft fit. The free length should exceed your required compressed length by enough to provide the working travel and load you need. Use the variant selector above to pick the OD and free length combination that matches your design.

Load capacity depends on the specific OD and free length selected, as these determine the spring's rate and maximum deflection. For precise load data, refer to the variant-specific specifications or contact us to confirm. As a general guide, a 3.5mm wire dia stainless spring in this size range is suited to moderate-to-heavy duty return-force applications.

Yes. 304 stainless steel provides good resistance to oxidation, moisture, and mild chemical exposure. It is suitable for outdoor mechanical assemblies, humid workshop environments, and light industrial applications. For highly aggressive chemical or saltwater environments, 316 stainless steel may be more appropriate.

These springs are designed to standard coil spring geometry and will fit any seat or housing machined to accept the selected OD. Always verify the OD, free length, and wire diameter against your fixture drawings before ordering. The closed ground ends provide flat, stable seating on standard spring pockets.

304 stainless steel compression springs typically perform reliably from –20°C to approximately +300°C (–4°F to +572°F). For sustained high-temperature applications above this range, consider high-temperature alloy springs. Contact us if you need guidance on temperature-specific selection.

Multi-piece packs are practical for prototyping (test multiple positions), replacement stock (keep a spare on hand), and multi-spring assemblies (parallel or series configurations). Having 5 pieces per order reduces downtime if one spring needs replacement during a project.

Spring rate is determined by wire diameter, OD, and number of active coils. If you need a specific rate value for your engineering calculation, please contact us with your selected variant details and we will provide the specification. For standard DIY and workshop use, selecting by OD and free length is typically sufficient.