Splines & Serrations

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What are Splines?

Splines are ridges or teeth type keys that are made integral with the shaft that mesh with grooves in a mating hub to transfer torque. For example, a bevel gear mounted on a shaft might use a male shaft spline that matches the female spline on the gear as shown in figure 1.

Spline shaft bevel gear connection
Figure 1. Spline shaft bevel gear connection

It’s used when there is a need for axial movement or the torque transmitted is too high for keyed joint.


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