Basic disk clutches and brakes are considered in this section.
The former transmits torque from the input to the output shaft by the frictional force developed between the two disks or plates when they are pressed together.
The latter is basically the same device, but one of the shafts is fixed. One of the friction surfaces of the clutch or brake is typically metal (cast iron or steel) and the other is usually a friction material or lining.
Magnetic, hydraulic, and pneumatic operating mechanisms are also available in disk, cone, and multiple disk clutches and brakes.