Knuckle couplings are mechanical devices used to connect two shafts or components, allowing for rotational movement. They consist of two parts that fit together, resembling a knuckle joint, which enables flexibility and alignment between the connected pieces. This design is commonly found in various machinery and vehicles, facilitating smooth operation. These couplings are particularly useful in applications where misalignment may occur, as they can accommodate angular and axial movements. They are often made from durable materials to withstand wear and tear, making them reliable in industries such as automotive, manufacturing, and construction.