Below is a list of Shaft Couplings manufacturers from. Flexible shaft couplings provide mechanical power in the form of torque to pieces of rotary equipment while allowing for variable degrees of misalignment between the shafts these devices connect. Shafts, such as driveshafts and line shafts, are used to provide rotary motion to a wide spectrum of vehicles, machines and equipment and shaft couplings are critical for providing secure rigid, flexible or non-linear connection between shafts, wheels and rotary equipment.