Good for hydraulic systems, machine tools, and other high-torque applications, these shafts have teeth that transmit high rotational loads. Compared to keyed shafts, they last longer and handle higher torque. They’re also better than keyed shafts for applications requiring frequent disassembly or adjustments because you can move bushings along their splines.

Involute splines have curved teeth, similar to the teeth on a gear. These teeth make more contact with a bushing than the teeth on parallel splines, so these splines are less prone to wear. They handle misalignment and reduce vibration.

Bushings act as a surface to transmit rotary motion or to position a load along the length of the shaft. If welded into place, these bushings can act as a coupler, connecting two splined shafts.