Wire Diameter 4mm Spring Steel Compression Spring Upto 400mm Long Various Diamet

Measure the bore or pocket that will house the spring. The spring's outer diameter should be 0.5–1.5 mm smaller than the bore to allow free movement without binding. For a shaft-guided spring, the inner diameter (OD minus twice the wire diameter, approximately OD − 8 mm for this 4 mm wire) should clear the shaft by at least 0.5 mm.

Select a free length that is longer than your required working length. The difference between free length and working (compressed) length determines the available stroke. As a starting point, choose a free length roughly 20–30% longer than the maximum compressed position in your assembly.

Load capacity depends on the specific OD and free length combination. Spring rate (N/mm) and maximum load vary by variant. If you need exact load data for a specific variant, contact us with your OD and length selection and we can provide further guidance.

These springs are made from uncoated spring steel and offer standard corrosion resistance suitable for indoor, dry, or lightly humid environments. For outdoor, wet, or chemically aggressive environments, consider applying a protective coating (e.g., zinc spray or oil) after installation, or contact us about alternative material options.

Yes — the closed and ground ends seat flat on standard spring pockets. Verify that your pocket diameter matches the selected OD (with 0.5–1.5 mm clearance) and that the pocket depth accommodates the compressed length of the spring under maximum load.

Yes. Spring steel compression springs are widely used in robotics for return mechanisms, gripper preloading, and linear actuator reset functions. Select the OD and length that fits your actuator bore and stroke requirements. For high-cycle applications, ensure the spring is not compressed beyond its solid height to maximize fatigue life.

Shorter springs (20–100 mm free length) are typically available in 5-piece packs, mid-length springs (150–200 mm) in 2-piece packs, and longer springs (305–400 mm) as single pieces. This reflects the practical weight and cost per unit at each length. Choose the quantity that matches your project needs.