A flexible coupling is a mechanical device designed to connect two rotating shafts, enabling efficient torque transmission while accommodating various types of misalignment that may occur during operation. Unlike rigid couplings that require perfect alignment, it can handle angular, parallel, and axial misalignments caused by thermal expansion, installation errors, or equipment deflection under load, thus reducing stress on shafts and bearings. This flexibility also helps dampen vibrations and absorb shock loads, protecting connected machinery from damage and extending their service life. Elastic couplings are widely used in various industrial applications, from small precision equipment to heavy-duty machinery, such as pumps, compressors, motors, and conveyors. They are constructed using different materials, including metals, elastomers, and polymers, each selected based on the specific requirements of the application, such as torque capacity, speed, and environmental conditions. Some designs feature a single-piece structure to avoid backlash, while others use elastic elements to enhance vibration damping. By facilitating smooth power transmission and compensating for misalignments, flexible couplings play a crucial role in ensuring the stability and efficiency of mechanical systems, minimizing downtime and maintenance needs.