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What is the spring index (winding ratio)? The spring index (winding ratio) is a key design parameter in the engineering and manufacturing of compression springs, tension springs, and torsion springs. It helps determine the relationship between the coil diameter and the wire diameter, thus affecting the spring's performance, durability, and manufacturability. Understanding the spring index allows engineers and manufacturers to design springs that are easier to manufacture, more reliable, and have a longer service life.

The 2026 Kansai Manufacturing World Japan is the largest professional manufacturing exhibition in Western Japan, showcasing the latest solutions in smart manufacturing, factory automation, metal processing, robotics, IoT/AI technologies, and 3D printing. The show brings together leading domestic and international equipment suppliers and manufacturers, making it a key platform for understanding industry trends, sourcing advanced machinery, and expanding global business opportunities.

The 2026 Taiwan International Hardware & Tools Expo × Hardware Industry Show features the latest tools, machinery, components, and smart manufacturing solutions, offering a complete hardware supply chain and global sourcing platform.