Magnetic Particle Clutch

[Taylor]

General industrial type Magnetic Particle Clutches range in torque from about
4 lb-in to 71 lb-in

There are bigger units available, but less common. People tend to start using pneumatics or hydraulics for the higher torque industrial tensioning applications.

There are smaller units too, but they tend to be more like the magnetic particle with permanent magnetic type clutches, often found in something like your office printer/copier.