Component with two mating parts (master and tool) that have been designed to lock together automatically (normally using pneumatic pressure) and are able to pass utilities (e.g. electrical signals, pneumatic supply, water, etc.). The master side of the tool changer mounts to a robot, or other structure. The tool side of the tool changer mounts to tooling, such as grippers, welders, or deburring tools. A robotic tool changer is also known as an automatic tool changer, robot tool changer, robot coupler, robotic coupler, and robotic connector.