Explanation: Oldham Coupling is used to join two shafts that have a lateral misalignment. It consists of two flanges C and D with slots and a central floating part E with two tongues T1 and T2 at right angles. The resultant of these two components of motion will accommodate lateral misalignment of the shaft as they rotate. [ alt="SSC JE MEchanical 2 5" src="//storage.googleapis.com/tb-img/production/19/04/SSC%20JE%20MEchanical%202_5.PNG" style="width: 355px; height: 286px;"> This coupling is used when there is some lateral misalignment, that is, axes of both the shafts are parallel, but not co-axial. Torque is transmitted through the pressure between the slot and tongue. The pressure is the maximum at the outer periphery and zero at the centroid. Here the torsional load is transferred along the shaft axis and rotation is transferred along the shaft axis.