This document outlines the 7 step process for designing a rigid flange coupling to transmit power between two shafts. The steps include: 1) calculating the shaft diameter based on the torque to be transmitted, 2) selecting a coupling based on the shaft diameter, 3) checking the shear strength of the coupling bolts, 4) checking the bearing strength of the bolts, 5) drawing a sketch of the coupling with dimensions, 6) comparing the allowable and actual torques and increasing key dimensions if needed, and 7) drawing a final sketch if all strength requirements are satisfied.