Compression Springs Wire Dia 1.2mm Length 10-305mm Diameter 8-20mm Spring Steel

Measure the bore or pocket that will house the spring. The spring's outer diameter should be slightly smaller than the bore to allow free movement without binding. For a guide rod application, the spring's inner diameter (OD minus 2× wire diameter) must clear the rod. Use the variant selector to match your required OD from the 8–20mm range.

Free length is the uncompressed length of the spring. Select a free length longer than your required working travel plus the solid height. As a conservative starting point, the free length should be at least 1.5× your desired working stroke. The 305mm variants are ideal when you need a long spring that can be cut or used in full for extended travel applications.

These springs are made from spring steel, which offers good mechanical properties for cyclic loading. Spring steel has moderate corrosion resistance in dry indoor environments. For humid, outdoor, or chemical-exposure environments, consider applying a light coat of oil or grease, or contact us to confirm suitability for your specific conditions.

Spring rate depends on wire diameter, outer diameter, free length, and number of active coils — all of which vary by variant. Because this listing covers a wide size matrix, specific spring rate values differ per variant. If you need an exact spring rate for your design, please contact us with your selected variant dimensions and we will provide the calculated value.

Spring steel has limited corrosion resistance when exposed to moisture over extended periods. For outdoor or wet-environment use, we recommend applying a protective coating such as a light machine oil or zinc-based spray. For long-term outdoor installations, stainless steel springs may be a better fit — contact us to discuss alternatives.

The 10Pcs pack is available for shorter length variants (10–50mm free length) and is ideal for prototyping, batch builds, or keeping spares on hand. The 1Pcs option is offered for the longer 305mm variants, which are typically used individually or cut to length for specific applications. Select the quantity that matches your project needs using the Amount variant selector.

Yes. The wide OD range (8–20mm) and length range (10–305mm) make these springs well-suited for integration into 3D-printed spring pockets, custom jigs, and small automation mechanisms. The closed and ground ends provide stable seating against flat printed surfaces, reducing lateral movement during operation.