Compression Spring 1.2mm Wire Dia 8-13mm Dia 10-200mm Length A2 Stainless Steel

Select based on three key dimensions: outer diameter (OD) to fit your spring pocket, free length to achieve the required travel and preload, and wire diameter for the load you need. This listing covers OD 8–13mm and free lengths 10–200mm, all with 1.2mm wire. If you know your required spring rate or load, contact us to confirm the best match.

A2 stainless steel (equivalent to Grade 304) contains approximately 18% chromium and 8% nickel, giving it strong resistance to rust, oxidation, and mild acids. For compression springs used outdoors, in damp enclosures, or near water, A2 stainless significantly outlasts uncoated carbon steel springs.

A2 stainless steel offers good corrosion resistance for most outdoor and light marine applications. For highly aggressive saltwater or chemical environments, A4 (316) stainless would be more appropriate. For general outdoor DIY, robotics, and light industrial use, A2 performs reliably.

If you need a single spring for a repair or prototype, choose the 1-piece option (available for longer lengths). For small production runs or to keep spares on hand, the 5- or 10-piece packs offer better value per spring. The 20- and 50-piece packs are suited for batch manufacturing or stocking a workshop.

Yes. The 1.2mm wire diameter and 8–13mm OD range is well-suited for return mechanisms, end-stop buffers, and preload assemblies in small robotic actuators, linear slides, and gripper mechanisms. The stainless construction also handles repeated cycling without corrosion-related fatigue degradation in typical lab or workshop conditions.

Use digital calipers to measure the outer diameter across the widest point of the coil. For free length, measure the spring in its uncompressed (natural) state from end to end. Match these measurements to the variant options in this listing. If your existing spring is worn or deformed, measure the spring pocket (bore) diameter and subtract approximately 0.5–1mm to find the correct OD.

Closed ends have the last coil touching the adjacent coil, creating a flat bearing surface. This improves stability, reduces lateral buckling, and allows the spring to sit squarely in a pocket or against a flat surface. Open-end springs have a gap at the end coil and are typically used where end contact is not critical. The springs in this listing feature closed ends.