A spline shaft is a cylindrical shaft that comes with grooves or ridges on its surface. The grooves or ridges are designed to fit precisely with matching ridges or grooves of another object, typically a gear or a coupling. This type of shaft is commonly used in various industrial and manufacturing applications as it provides a secure and reliable connection between two parts.

These shafts come in various materials and sizes to suit different applications. Spline shafts are generally made of high-grade steel, aluminum, or titanium to ensure strength, durability, and resistance to wear and tear. They are used in power transmission systems found in vehicles, heavy machinery, aircraft, and marine applications.

Overall, spline shafts are essential components in manufacturing and industrial processes, providing a means of transferring torque and power while ensuring optimal performance, efficiency, and safety.