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.

Parallel splines have large, straight-sided teeth that resemble machine keys and transmit more torque than involute spline teeth. These splines are known as straight splines.

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.

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