Why are pot magnets so strong?

What is a pot magnet?

A pot magnet consists of a powerful neodymium magnet placed in a steel casing, also known as the "pot." This steel pot is much more than just protection; it forms an essential part of the magnetic system.

Where an ordinary magnet disperses its magnetic field all around, the magnetic field of a pot magnet is directed to one side by the steel casing. This creates a much higher holding force on the contact surface.

How does the steel pot work?

The steel pot functions as a magnetic circuit.

Normally, part of the magnetic field is lost through the sides and back of a magnet. In a pot magnet, the steel casing captures these field lines and directs them back to the working surface.

As a result, almost all magnetic energy is concentrated on one side of the magnet. The result is a much higher holding force than a loose magnet of the same dimensions.

Why is the holding force so much higher?

A loose neodymium magnet radiates its magnetic field all around.

In a pot magnet, this field is bundled towards the contact surface. This creates a higher flux density at the point where the magnet makes contact with steel.

This explains why a relatively small pot magnet often holds more strongly than a larger loose disc magnet.

When does a pot magnet achieve its maximum holding force?

The specified holding force is only achieved under ideal conditions:

• Direct contact with steel
• A flat surface
• A clean surface
• Sufficient material thickness (preferably solid steel)

Paint, rust, dirt, coatings, or an air gap between the magnet and steel can significantly reduce the holding force.

Why are there so many designs?

Pot magnets are available with:

• Internal thread
• External thread
• Threaded bushings
• Countersunk holes
• Hooks
• Eyes
• Rubber coating

These designs make it possible to hang objects, attach constructions, or create temporary mounting points without drilling.

When do you choose a pot magnet?

Pot magnets are ideal for:

• Displays and advertising boards
• Machine building
• Interior design
• Lighting
• Workshop equipment
• Temporary fixings
• Suspension systems

Wherever a high holding force is required on a steel surface, a pot magnet is often the most efficient solution.