Machine Design and Engineering

Pinned Sleeve Shaft Coupling Design Equations and Calculator.

Torque Capacity of Pin T = π d² D τ / 4

Where:

Symbols used:
D = Shaft diameter (m)
d = Pin diameter (m)
T = Torque capacity (N-m)
τ = Allowable shear stress (Pa)

Reference:

Mechanical Engineers Databook, Carvil