Compression Spring Wire Dia 1.0mm Pressure-Coil Springs A2/304 Stainless Steel

Measure the bore or housing that will contain the spring. The spring's outer diameter should be slightly smaller than the bore diameter to allow free movement without binding. If the spring rides on a guide rod, the inner diameter (outer diameter minus twice the wire diameter) must clear the rod. Use the variant selector above to pick the outer diameter that fits your housing.

Free length is the uncompressed length of the spring. Select a free length longer than your required working length so the spring can be compressed to your target load. As a starting point, the free length is typically 1.2–1.5× the compressed working length, but this depends on your specific spring rate and load requirements.

A2/304 stainless steel offers good resistance to atmospheric corrosion, fresh water, and mild chemical exposure. It is suitable for most indoor and sheltered outdoor applications. For highly aggressive environments such as salt spray or strong acids, A4/316 stainless steel would be a more appropriate choice.

304 stainless steel is widely used in food-processing equipment and is generally considered food-safe for incidental contact. However, suitability for specific regulated applications depends on your local standards and certifications. Please contact us to confirm if you require documentation for compliance purposes.

Both pack sizes contain identical springs — the only difference is quantity. The 10-piece pack is ideal for prototyping, repairs, or low-volume builds. The 50-piece pack offers a lower per-unit cost and is suited to production runs or stocking a workshop. Select your preferred quantity in the "Length & Packing Qty" option above.

Spring rate (k) is calculated as k = Gd⁴ / (8D³n), where G is the shear modulus of the material (~77 GPa for 304 stainless), d is the wire diameter, D is the mean coil diameter, and n is the number of active coils. If you need a specific spring rate confirmed, please contact us with your outer diameter and free length selection and we can provide further guidance.

Based on the compact dimensions and typical manufacturing practice for springs in this size range, the ends are expected to be closed. Ground ends are more common on larger springs; for this wire diameter and size range, end finish details can be confirmed by contacting us before ordering if your application requires a specific end type.