Compression Spring Various Size Wire Diameter 1.6~1.8 mm Stainless Steel

A thicker wire diameter (1.8 mm) produces a stiffer spring with a higher spring rate for the same outer diameter and free length. Choose 1.6 mm wire when you need lighter return force or more deflection travel; choose 1.8 mm when you need greater load capacity and less deflection under the same force. If you are replacing an existing spring, match the wire diameter exactly to maintain the original spring rate.

The outer diameter (OD) must fit inside your spring housing or bore with a small clearance — typically 0.5 mm to 1 mm smaller than the bore ID. The inner diameter (ID) must clear your guide rod with a similar gap. As a rough guide, ID ≈ OD − (2 × wire diameter). Verify both dimensions against your assembly before ordering.

Yes. Stainless steel wire provides good resistance to oxidation and light corrosion in humid or mildly corrosive environments. These springs are not rated for immersion in strong acids, chlorinated water, or salt spray over extended periods. For harsh marine or chemical environments, verify the specific stainless alloy grade meets your requirements.

Shorter free lengths (10 mm to 50 mm) are available in 5-piece packs, which is ideal for prototyping, testing multiple positions, or stocking spares. Longer free lengths (60 mm to 200 mm) are sold as single pieces, making it cost-effective to source exactly the quantity you need for a specific repair or build.

Stainless steel compression springs handle light moisture and humidity well without rusting under normal conditions. For outdoor use with intermittent rain exposure, they perform reliably. Avoid prolonged submersion or exposure to salt spray without additional protective measures, as this can eventually affect surface finish and fatigue life.

Free length is the uncompressed length of the spring. To select the right free length, determine your required working length (compressed length under load) and add the expected deflection. For example, if your assembly compresses the spring by 20 mm and you need 30 mm of working length, choose a free length of approximately 50 mm. Always allow a safety margin to avoid solid height contact.

Yes. These stainless steel compression springs are well-suited for DIY automation fixtures, return-force mechanisms, end-stop buffers, and lightweight robotics assemblies. The wide range of OD and length options makes it straightforward to find a spring that fits standard 3D-printed or machined spring seats without custom tooling.