Which of the following is considered a mechanical coupling?

A mechanical coupling is a device used to connect two shafts or pipes, allowing for the transmission of torque or fluid between them while accommodating misalignment, thermal expansion, or vibration. Victaulic couplings are a type of mechanical coupling specifically designed for joining piping systems. They utilize a groove system that allows for easy installation and disassembly without the need for welding or threaded connections, making them particularly advantageous in various applications.

Victaulic couplings provide flexibility in connecting pipes of different materials and diameters and can absorb shock and vibration, which helps maintain the integrity of the piping system. This quality makes them a preferred choice in many industries when a reliable mechanical connection is required that also allows for potential future modifications or repairs.

Other options, such as flanged joints, welded connections, and threaded joints, represent different methods of joining pipes that either involve permanent fixes or require more complex installation processes. While they each have their own specific uses and advantages, they do not fall into the same category as mechanical couplings that offer the flexibility and ease of use characteristic of Victaulic connections.