How do you design an involute spline connection for torque transmission?

Involute splines are designed per SAE/ANSI B92.1. Torque capacity T = p.L.r_m.z.h.phi where p is allowable pressure (7-21 MPa depending on fit), L is effective length, r_m is mean radius, z is number of teeth, h is tooth height, phi is load sharing factor (0.5-0.75). Check shear stress in teeth: tau = T/(pi.D.L.t.phi) < tau_allowable. For side-fit splines, verify wear and surface durability. Include factors for misalignment, edge loading, and sliding wear in loose splines. Press-fit major diameter for better concentricity. Specify profile tolerance and hardness (50-60 HRC case) for wear resistance.