Coupling is a machine element that attaches two mechanical shafts together by their ends for power transmission. It is primarily used to assist rotating machine components such as motors for driving conveyor belts. Couplings are also used to connect and disconnect various fluid systems such as oil, gas, air, and chemicals, and powder systems. Couplings prevent shafts to get disconnect during operation while some torque limiting couplings can restrict rotating motion when a specific torque limit is surpassed. Couplings also permit some degree of end movement or misalignment or both. Therefore, careful selection and installation of couplings that reduce downtime and maintenance cost offers cost advantages. Unlike the traditional nut and bolt joints, couplings are oil and lubricant free; they are light in weight, offer high torque, easy to mount and dismount, allow high range of misalignment and offers high resistance to environmental conditions. Couplings are of t...