Claw Coupling, Three-Jaw Cast Iron, 105 Outer Diameter, Pure Handcrafted Gear for Oil Pumps and Water Pumps

A coupler is a device that connects two shafts or a shaft to a rotating part, rotating together during the transmission of motion and power, and remains detached under normal circumstances. It is also sometimes used as a safety device to prevent the connected components from bearing excessive loads, serving as an overload protection function.