Ansi B 92.1 Pdf 38 -

. This ensures that an external spline fits perfectly into an internal hub without looseness or interference across its entire axial length Module vs. Diametral Pitch

By mastering ANSI B92.1, you ensure that your splines will slide smoothly, torque will be transferred without fail, and your machined parts will mate perfectly with any compliant component worldwide. Now that you know what to look for, go get that measurement over pins and get your spline cutting. ansi b 92.1 pdf 38

Page 38 often details the geometry:

They naturally center under load, which helps equalize bearing stresses. torque will be transferred without fail